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User Manual
Version 1.1
Table of Contents
Get started 7
What's in the box 7
Charge your watch 8
Set up Sense 2 9
See your data in the Fitbit app 10
Unlock Fitbit Premium 11
Wear Sense 2 12
Placement for all-day wear vs. exercise 12
Fasten the band 13
Handedness 14
Wear and care tips 15
Change the band 15
Remove a band 15
Attach a band 16
Basics 17
Navigate Sense 2 17
Basic navigation 17
Button shortcuts 18
Quick settings 19
Tiles 21
Adjust settings 21
Display 21
Vibration &audio 21
Notifications 22
Goal reminders 22
Quiet modes 22
Shortcut 22
Voice assistant 23
About Sense 2 23
Check battery level 23
2
Set up device lock 24
Adjust always-on display 24
Turn off the screen 25
Clock Faces, Tiles, and Apps 27
Change the clock face 27
Rearrange tiles 28
Manage apps 28
Open apps 28
Remove apps 28
Reinstall apps 29
Update apps 29
Adjust app settings and permissions 29
Voice Assistant 30
Set up Amazon Alexa Built-in 30
Interact with your voice assistant 30
Check Alexa alarms, reminders, and timers 32
Lifestyle 33
Weather 33
Find Phone 34
GoogleMaps 34
Notifications from your phone 35
Set up notifications 35
See incoming notifications 35
Manage notifications 36
Turn off notifications 36
Answer or reject phone calls 37
Take on-wrist phone calls 38
Respond to messages (Android phones) 39
Timekeeping 40
Set an alarm 40
Dismiss or snooze an alarm 40
Use the timer or stopwatch 41
3
Time events with the stopwatch 41
Keep track of elapsed time with the countdown timer 41
Activity and Wellness 43
See your stats 43
Track a daily activity goal 45
Choose a goal 45
Track your hourly activity 45
Track your sleep 46
Set a sleep goal 46
Get insights into your long-term sleep behaviors 46
Learn about your sleep habits 47
Track your skin temperature changes 47
Manage stress 49
Use the EDA Scan app 50
Practice guided breathing 50
Check your stress management score 51
Track your body responses 52
Advanced health metrics 53
Exercise and Heart Health 54
Track your exercise automatically 54
Track and analyze exercise with the Exercise app 55
Customize your exercise settings 56
Check your workout summary 57
Check your heart rate 57
Custom heart-rate zones 59
Earn Active Zone Minutes 59
Receive heart-rate notifications 59
Check your daily readiness score 60
View your cardio fitness score 61
Share your activity 61
Contactless Payments 62
Use credit and debit cards 62
Set up contactless payments 62
4
Make purchases 63
Change your default card 64
Pay for transit 65
Update, Restart, and Erase 66
Update Sense 2 66
Restart Sense 2 66
Shutdown Sense 2 67
Erase Sense 2 67
Troubleshooting 68
Heart-rate signal missing 68
GPS signal missing 68
Other issues 69
General Info and Specifications 70
Sensors andComponents 70
Materials 70
Wireless technology 71
Haptic feedback 71
Battery 71
Memory 71
Display 71
Band size 71
Environmental conditions 72
Learn more 72
Return policy and warranty 72
Regulatory and Safety Notices 73
USA:Federal Communications Commission(FCC) statement 73
Canada:Industry Canada (IC)statement 74
European Union (EU) 75
Argentina 77
Australia and New Zealand 77
Ghana 77
Indonesia 77
5
Israel 78
Japan 78
Kingdom of Saudi Arabia 78
Malaysia 79
Mexico 79
Morocco 79
Nigeria 80
Oman 80
Paraguay 80
Philippines 80
Serbia 81
Singapore 81
South Korea 81
Taiwan 81
Thailand 85
United Arab Emirates 85
United Kingdom 85
Vietnam 86
About the Battery 86
IP Rating 87
Safety Statement 87
Regulatory Markings 87
6
Get started
Meet Fitbit Sense 2 by Google—the smartwatch designed to help you stress less,
sleep better, and live healthier.
Take a moment to review our complete safety information at fitbit.com/safety.
Sense 2 is not intended to provide medical or scientific data.
What's in the box
Your Sense 2 box includes:
Watch with small band
(color and material varies) Charging cable Additional large band
The detachable bands on Sense 2 come in a variety of colors and materials, sold
separately.
7
Charge your watch
A fully-charged Sense 2 has a battery life of 6+ days. Battery life and charge cycles
vary with use and other factors; actual results will vary.
To charge Sense 2:
1. Plug the charging cable into the USB port on your computer, a UL-certified
USB wall charger, or another low-energy charging device.
2. Hold the other end of the charging cable near the port on the back of the
watch until it attaches magnetically. Make sure the pins on the charging cable
align with the port on the back of your watch.
Charge Sense 2 for 12 minutes for 24 hours of battery life. While the watch charges,
tap the screen twice or press the button to turn the screen on. Charging fully takes
about 1-2 hours.
8
Set up Sense 2
Set up Sense 2 with the Fitbit app for iPhones or Android phones. The Fitbit app is
compatible with most popular phones. See fitbit.com/devices to check if your
phone is compatible.
To get started:
1. Download the Fitbit app:
lApple App Store for iPhones
lGoogle Play Store for Android phones
2. Install the app, and open it.
lIf you already have a Fitbit account, log in to your account tap the
Today tab your profile picture Set Up a Device.
lIf you don't have a Fitbit account, tap Join Fitbit to be guided through a
series of questions to create a Fitbit account.
3. Continue to follow the on-screen instructions to connect Sense 2 to your
account.
When you're done with setup, read through the guide to learn more about your new
watch and then explore the Fitbit app.
For more information, see the related help article.
9
See your data in the Fitbit app
Open the Fitbit app on your phone to view your activity, health metrics, and sleep
data; log food and water; participate in challenges; and more.
10
Unlock Fitbit Premium
Fitbit Premium is your personalized resource in the Fitbit app that helps you stay
active, sleep well, and manage stress. A Premium subscription includes programs
tailored to your health and fitness goals, personalized insights, hundreds of
workouts from fitness brands, guided meditations, and more.
Customers can redeem a Fitbit Premium trial subscription in the Fitbit app.
For more information, see the related help article.
11
Wear Sense 2
WearSense 2 around your wrist. If you need to attach a different size band, or if you
purchased another band, see the instructions in "Change the band" on page15.
Placement for all-day wear vs. exercise
When you're not exercising, wear Sense 2 a finger's width above your wrist bone.
In general, it's always important to give your wrist a break on a regular basis by
removing your watch for around an hour after extended wear. We recommend
removing your watch while you shower. Although you can shower while wearing
your watch, not doing so reduces the potential for exposure to soaps, shampoos,
and conditioners, which can cause long-term damage to your watch and may cause
skin irritation.
For optimized heart-rate tracking while exercising:
lDuring workouts, try moving the band higher on your wrist to get a better fit.
If you experience any discomfort, loosen the band, and if it persists give your
wrist a break by taking it off.
12
lWear your watch on top of your wrist, and make sure the back of the device is
in contact with your skin.
Fasten the band
1. Place Sense 2 around your wrist.
2. Slide the bottom band through the first loop in the top band.
3. Tighten the band until it fits comfortably, and press the peg through one of
the holes in the band. If you use one of the last two holes in the smaller band,
we recommend swapping to the larger band for a more secure fit. For
13
instructions, see "Change the band" on the facing page.
4. Slide the loose end of the band through the second loop until it lies flat on
your wrist. Make sure the band isn’t too tight. Wear the band loosely enough
that it can move back and forth on your wrist.
Handedness
For greater accuracy, you must specify whether you wear Sense 2 on your
dominant or non-dominant hand. Your dominant hand is the one you use for writing
and eating. To start, the Wrist setting is set to non-dominant. If you wear Sense 2 on
your dominant hand, change the Wrist setting in the Fitbit app:
From the Today tab in the Fitbit app, tap your profile picture Sense 2 tile
Wrist Dominant.
14
Wear and care tips
lClean your band and wrist regularly with a soap-free cleanser.
lIf your watch gets wet, remove and dry it completely after your activity.
lTake your watch off from time to time.
lIf you notice skin irritation, remove your watch and contact customer support.
For more information, see fitbit.com/productcare.
For more information, visit the Fitbit Wear & Care page.
Change the band
Sense 2 comes with a small band attached and an additional large, bottom band in
the box. Boththe top and bottom bands can be swapped with accessory bands,
sold separately on fitbit.com. For band measurements, see "Band size" on page71.
Fitbit Sense, Fitbit Versa 3, and Fitbit Versa 4 bands are compatible with Sense 2.
Remove a band
1. Turn over Sense 2 and find the band latches.
2. To release the latch, slide the flat button toward the band.
15
3. Gently pull the band away from the watch to release it.
4. Repeat on the other side.
Attach a band
To attach a band, press it into the end of the watch until you hear a click and it
snaps into place. The band with the loops and peg attaches to the top of the watch.
16
Basics
Learn how to manage settings, set a personal PIN code, navigate the screen, and
check the battery level.
Navigate Sense 2
Sense 2 has a colorAMOLEDtouchscreen display and 1 button.
Navigate Sense 2 by tapping the screen, swiping side to side and up and down, or
pressing the button. To preserve battery, the watch’s screen turns off when not in
use, unless you turn on the always-on display setting. For more information, see
"Adjust always-on display" on page24.
Basic navigation
The home screen is the clock.
lSwipe down to see quick settings
lSwipe up to see your notifications.
lSwipe left or right to see your tiles.
lPress the button to open the apps menu or return to the clock face.
17
Button shortcuts
Use the button to quickly access contactless payments, voice assistant, quick
settings, or your favorite apps.
18
Press the button
Press the button to return to the clock face. From the clock face, press the button to
open a list of the apps installed on your watch.
Press and hold the button
Hold the button for 1 second to activate a feature of your choice. The first time you
use the button shortcut, select which feature it activates. To change which feature
activates when you hold the button, open the Settings app on your watch and
tap Shortcut. Check that the long press shortcut is turned on , and then tap
Long press to select the app you want.
Double-press the button
Double-press the button to open shortcuts to your voice assistant, quick settings,
notifications, and contactless payment. Tap a shortcut to open it.
Quick settings
From the clock face, swipe down to access the quick settings.
19
Do Not Disturb When the do not disturb setting is on:
lNotifications, goal celebrations, and reminders
are muted.
lThe do not disturb icon illuminates in quick
settings.
You can't turn on the do not disturb setting and sleep
mode at the same time.
Sleep Mode When the sleep mode setting is on:
lNotifications, goal celebrations, and reminders
are muted.
lThe screen's brightness is set to dim.
lThe Always-On Display clock face is turned off.
lThe screen stays dark when you turn your wrist.
lThe sleep mode icon illuminates in quick
settings.
Sleep mode turns off automatically when you set a
sleep schedule. For more information, see "Adjust
settings" on the facing page.
You can't turn on the do not disturb setting and sleep
mode at the same time.
Settings For additional settings, tap the Settings icon to open
the Settings app. For more information, see "Adjust
settings" on the facing page.
Screen Wake When you set screen wake to Button & motion, the
screen turns on each time you turn your wrist, press the
button, or tap the screen.
When you set screen wake to Button only, press the
button or tap the screen to turn on the display.
Brightness Adjust the screen brightness.
20
Always-On Display Turn always-on display on or off. For more information,
see "Adjust always-on display" on page24.
Tiles
From the clock face, swipe right or left to navigate through your tiles. View your
progress toward your daily goal, see a summary of today’s activity, check your
heart rate throughout the day, view your latest sleep metrics, see the body
responses your watch detected, set a timer, start an exercise, or check the weather
forecast.
Customize your watch by changing which tiles are included and the order they’re
shown in. For more information, see "Rearrange tiles" on page28.
Adjust settings
Manage basic settings in the Settings app :
Display
Brightness Change the screen's brightness.
Screen
wake
Change whether the screen turns on when you turn your wrist.
Screen
timeout
Adjust the amount of time before the screen turns off or switches to
the always-on display clock face.
Always-on
display
Turn always-on display on or off. For more information, see "Adjust
always-on display" on page24.
Vibration &audio
Vibration Adjust your watch's vibration strength.
Microphone Choose whether your watch can access the microphone.
21
Notifications
Unread
indicator
Choose if you want to see an icon at the bottom of the clock face
when you have unread notifications.
Goal reminders
Active Zone Minutes
goal
Turn Active Zone Minutes weekly goal notifications on or
off.
Quiet modes
Focus mode Turn off notifications while using the Exercise app .
Do not
disturb
Turn off all notifications.
Sleep mode Adjust sleep mode settings, including setting a schedule for the
mode to automatically turn on and off.
To set a schedule:
1. In the Sleep Mode section, tap Schedule mode.
2. Tap the start or end time to adjust when the mode turns on
and off. Swipe up or down to change the time, and tap the
time to select it. Sleep mode automatically turns off at the
time you schedule, even if you manually turned it on.
Alexa
notifications
Turn Amazon Alexa notifications off.
Shortcut
Button long
press
Choose the app or feature you want to open when you press and
hold the button.
22
lYou can't use the voice assistant feature
lYou can't use quick replies
Charge Sense 2 to use or adjust these features.
Set up device lock
To help keep your watch secure, turn on device lock in the Fitbit app, which
prompts you to enter a personal 4-digit PINcode to unlock your watch. If you set
up contactless payments on your watch, device lock is turned on automatically and
you're required to set a code. If you don't use contactless payments, device lock is
optional.
Turn on device lock or reset your PINcode in the Fitbit app:
From the Today tab in the Fitbit app, tap your profile picture Sense 2 tile
Device Lock.
For more information, see the related help article.
Adjust always-on display
Turn on always-on display to show the time on your watch, even when you're not
interacting with the screen.Many clock faces and certain apps have an always-on
display mode.
24
To turn always-on display on or off, swipe down from the clock face to open quick
settings. Tap the always-on display icon .
Note that turning on this feature impacts your watch's battery life. When always-on
display is turned on, Sense 2 requires more frequent charging.
Always-ondisplay automatically turns off when your watch's battery is critically
low.
For more information, see the related help article.
Turn off the screen
To turn off your watch's screen when not in use, briefly cover the watch face with
your opposite hand or turn your wrist away from your body.
25
Note that if you turn on the always-on display setting, the screen won't turn off.
26
Clock Faces, Tiles, and Apps
The Fitbit Gallery offers apps and clock faces to personalize your watch and meet a
variety of health, fitness, timekeeping, and everyday needs.
Change the clock face
The Fitbit Gallery offers a variety of clock faces to personalize your watch.
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. Tap Gallery Clocks tab.
3. Browse the available clock faces. Tap a clock face to see a detailed view.
4. Tap Install to add the clock face to Sense 2.
Save up to 5 clock faces to switch between them:
lWhen you select a new clock face, it’s automatically saved unless you already
have 5 saved clock faces.
lTo see your saved clock faces in the Fitbit app, tap the Today tab your
profile picture your device image Gallery. See your saved clock faces
in My Clock Faces.
lTo remove a clock face, tap the clock face Remove clock face.
lTo switch to a saved clock face, tap the clock face Select.
27
Rearrange tiles
From the clock face, swipe right or left to navigate through your tiles. To manage
which tiles are included and the order they’re shown in:
1. From the Today tab in the Fitbit app, tap your profile picture your
device image Gallery.
2. In the My Tiles section of the Sense 2 tab, tap Manage.
lTo rearrange the tiles, tap and hold the grid icon. Move the tile up or
down in the list, then release it to place it in a new position.
lTo delete a tile, press the X icon Remove.
lTo add a tile, tap Add tile tap the tile you want to add Install.
Manage apps
Customize your watch with your favorite apps.
Open apps
From the clock face, press the button to see the apps installed on your watch. Your
most recently used apps appear at the top. Swipe up to browse your apps. To open
an app, tap it.
Remove apps
You can remove most apps installed on Sense 2:
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. Tap Gallery.
3. Tap the app you want to remove. You might need to swipe up to find it.
4. TapUninstall.
28
Reinstall apps
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. Tap Gallery Apps tab.
3. Browse the available apps. When you find one you want to install, tap it.
4. Tap Install to add the app to Sense 2.
For more information, see the related help article.
Update apps
Occasionally, you need to update apps installed on Sense 2.
To update an app:
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. Tap Gallery. Find the app you want to update. You might need to swipe up to
find it.
3. Tap the Update button next to the app.
Adjust app settings and permissions
Many apps include options to adjust the notifications, allow certain permissions, and
customize what it displays. Note that turning off any app permissions might cause
the app to stop functioning.
To access these settings:
1. With your watch nearby, in the Fitbit app, tap the Today tab your
profile picture your device image.
2. Tap Gallery.
3. Tap the app or clock face whose settings you want to change. You might need
to swipe up to see some apps.
4. Tap Settings or Permissions.
5. Tap the back arrow when you're done making changes.
29
Voice Assistant
Check the weather, set timers and alarms, control your smart home devices, and
more by speaking to your watch.
Set up Amazon Alexa Built-in
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. TapAmazon Alexa Sign in with Amazon.
3. Tap Get Started.
4. Log in to your Amazon account or create one if necessary.
5. Follow the on-screen instructions and read about what Alexa can do, and tap
Close to return to your device settings in the Fitbit app.
To change the language Alexa recognizes:
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. TapAmazon Alexa.
3. Tap the current language to change it, or tap Logout to stop using Alexa on
your watch.
Interact with your voice assistant
1. Open the Alexa app on your watch. Note that the Fitbit app must be
running in the background on your phone.
2. Say your request.
30
You don't need to say "Alexa" before speaking your request. For example:
lSet a timer for 10 minutes.
lSet an alarm for 8:00 a.m.
lWhat's the temperature outside?
lRemind me to make dinner at 6:00 p.m.
lHow much protein is in an egg?
lAsk Fitbit to start a run.*
lStart a bike ride with Fitbit.*
*To ask Alexa to open the Exercise app on your watch, you must first set up the
Fitbit skill for Alexa. For more information, see the related help article. These
commands are currently available in English, German, French, Italian, Spanish, and
Japanese.
Amazon Alexa isn't available in all countries. For more information, see
fitbit.com/voice.
Note that saying “Alexa” doesn’t activate the voice assistant on your watch—you
must open the voice assistant app on your watch before the microphone turns on.
The microphone turns off when you close your voice assistant, or when your
watch’s screen turns off.
For added functionality, install the Amazon Alexa app on your phone. With the app,
your watch can access additional Alexa skills.
For more information, see the related help article.
31
Check Alexa alarms, reminders, and timers
1. Open the Alexa app on your watch.
2. Tap the alerts icon and swipe up to view your alarms, reminders, and
timers.
3. Tap an alarm to turn it on or off. To adjust or cancel a reminder or timer, tap
the Alexa icon and say your request.
Note that Alexa's alarms and timers are separate from those you set in the Alarms
app or Timers app .
32
Lifestyle
Use apps to stay connected to what you care about most. See "Clock Faces, Tiles,
and Apps" on page27 for instructions on how to add and delete apps.
For more information, see the related help article.
Weather
See the weather in your current location, as well as 2 additional locations you
choose, in the Weather app on your watch.
Check the weather forecast in your current location in your tiles. From the clock
face, swipe left or right until you reach the Weather tile. Tap the panel at the bottom
of the screen to cycle between the current cloud cover, upcoming temperature
forecast, chance of rain, and air quality. Tap anywhere else on the tile to open the
Weather app , where you can see more details, as well as the weather forecast in
2 additional locations you choose.
If the weather for your current location doesn't appear, check that you turned on
location services for the Fitbit app. If you change locations or don't see updated
data for your current location, sync your watch to see your new location and latest
data in the Weather app or tile.
Choose your unit of temperature in the Fitbit app. For more information, see the
related help article.
33
To add or remove a city:
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. Tap Gallery.
3. Tap the Weather app. You might need to swipe up to find it.
4. Tap Settings Add city to add up to 2 additional locations or tap Edit the
Xicon to delete a location. Note that you can't delete your current location.
Find Phone
Use the Find Phone app to locate your phone.
Requirements:
lYour watch must be connected (“paired”) to the phone you want to locate.
lYour phone must have Bluetooth turned on and be within 30 feet (10m) of
your Fitbit device.
lThe Fitbit app must be running in the background on your phone.
lYour phone must be turned on.
To find your phone:
1. Open the Find Phone app on your watch.
2. Tap Find Phone. Your phone rings loudly.
3. When you locate your phone, tap Cancel to end the ringtone.
GoogleMaps
Get turn-by-turn directions on your wrist with the Google Maps app on your
watch.
For more information, see the related help article.
34
Notifications from your phone
Sense 2 can show call, text, calendar, and app notifications from your phone to keep
you informed. Keep your watch within 30 feet of your phone to receive
notifications.
Set up notifications
Check that Bluetooth on your phone is on and that your phone can receive
notifications (often under Settings Notifications). Then set up notifications:
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. Tap Notifications.
3. Follow the on-screen instructions to pair your watch if you haven't already.
Call, text, and calendar notifications are turned on automatically.
4. To turn on notifications from apps installed on your phone, including Fitbit and
WhatsApp, tap App Notifications and turn on the notifications you want to
see.
Note that if you have an iPhone, Sense 2 shows notifications from all calendars
synced to the Calendar app. If you have an Android phone, Sense 2 shows calendar
notifications from the calendar app you chose during setup.
For more information, see the related help article.
See incoming notifications
A notification causes your watch to vibrate. If you don't read the notification when it
arrives, you can check it later by swiping up on the clock face or by double-pressing
the button and tapping the notifications icon.
35
Manage notifications
Sense 2 stores up to 30 notifications, after which the oldest are replaced as you
receive new ones.
To manage notifications:
lFrom the clock face, swipe up to see your notifications and tap any
notification to expand it.
lTo delete a notification, tap to expand it, then swipe to the bottom and tap
Clear.
lTo delete all notifications at once, swipe up until you reach the end of your
notifications and tap Clear All.
lTo exit the notifications screen, press the button or swipe down.
Turn off notifications
Turn off certain notifications in the Fitbit app, or turn off all notifications in quick
settings on Sense 2. When you turn off all notifications, your watch won't vibrate
and the screen won't turn on when your phone receives a notification.
To turn off certain notifications:
1. From the Today tab in the Fitbit app on your phone, tap your profile
picture Sense 2 tile Notifications.
2. Turn off the notifications you no longer want to receive on your watch.
To turn off all notifications:
36
1. From the clock face, swipe down to access quick settings.
2. Tap the do not disturb icon . All notifications, including goal celebrations
and reminders, are turned off.
Note that if you use the do not disturb setting on your phone, you don't receive
notifications on your watch until you turn off this setting.
Answer or reject phone calls
If paired to an iPhone or Android phone, Sense 2 lets you accept or reject incoming
phone calls.
To accept a call, tap the green phone icon on your watch's screen. To reject a call,
tap the red phone icon to send the caller to voicemail.
The caller's name appears if that person is in your contacts list; otherwise you see a
phone number.
37
Take on-wrist phone calls
To set up on-wrist calls, from the Today tab in the Fitbit app on your phone, tap
your profile picture your device image On-Wrist Calls. Follow the
instructions below to set up on-wrist calls.
Android phone
Tap each setup requirement, and follow the on-screen instructions to
accept and turn on the necessary pairing permissions and requests.
lNote that if you see a See Instructions button, you might be using
an older version of the Fitbit app. Tap See Instructions, and use the
"iPhone" below instructions to set up on-wrist calls.
iPhone
1. Tap Start Setup.
2. On your phone, tap Settings Bluetooth. Your phone scans for
available devices.
3. When you see Sense 2 Controls/Calls as an available device, tap it.
A number appears on your phone screen.
4. When the same number appears on your watch, tap Pair.
5. Return to the Fitbit app on your phone. Tap Done to complete
setup.
To answer a call using on-wrist mode:
1. When you receive a phone call, tap the green phone icon on your watch.
Note that your phone must be nearby with the Fitbit app running in the
background.
2. Speak into your watch to talk to the other person. Their voice will come from
the speaker on your watch.
lTo adjust the volume of the speaker, tap the speaker icon minus
icon or plus icon . Swipe right to return to the previous screen.
38
lTo mute yourself, tap the microphone icon . Tap the same icon to
unmute yourself.
lTo switch to a keypad, tap the three dots icon Keypad. Swipe
right to return to the previous screen.
lTo switch the call to your phone, tap the three dots icon Phone.
Tap the watch icon to move the call back to your watch.
3. To end the call, tap the red phone icon .
For more information, see the related help article.
Respond to messages (Android phones)
Respond directly to text messages and notifications from certain apps on your
watch with preset quick replies or by speaking your reply into Sense 2. Keep your
phone nearby with the Fitbit app running in the background to respond to
messages from your watch.
To respond to a message:
1. Open the notification you want to respond to.
2. Choose how to reply to the message:
lTap the microphone icon to respond to the message using voice-to-
text. To change the language recognized by the microphone, tap
Language. After you speak your reply, tap Send, or tap Retry to try
again.
lTap the text icon to respond to a message from a list of quick replies.
lTap the emoji icon to respond to the message with an emoji.
For more information, including how to customize quick replies, see the related help
article.
39
Timekeeping
Alarms vibrate to wake or alert you at a time you set. Set up to 8 alarms to occur
once or on multiple days of the week. You can also time events with the stopwatch
or set a countdown timer.
Note that alarms and timers you set with a voice assistant are separate from the
ones you set in the Alarms app and Timers app. For more information, see "Voice
Assistant" on page30.
Set an alarm
Set one-time or recurring alarms with the Alarms app . When an alarm goes off,
your watch vibrates.
When setting an alarm, turn on Smart Wake to allow your watch to find the best
time to wake you starting 30 minutes before the alarm time you set. It avoids
waking you during deep sleep so you're more likely to wake up feeling refreshed. If
Smart Wake can’t find the best time to wake you, your alarm alerts you at the set
time.
For more information, see the related help article.
Dismiss or snooze an alarm
When an alarm goes off, your watch vibrates. To dismiss the alarm, tap the alarm
icon . To snooze the alarm for 9 minutes, tap the snooze icon .
Snooze the alarm as many times as you want. Sense 2 automatically goes into
snooze mode if you ignore the alarm for more than 1 minute.
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Use the timer or stopwatch
Time events with the stopwatch or set a countdown timer on your watch. You can
run the stopwatch and countdown timer at the same time.
If always-on display is on, the screen continues to display the stopwatch or
countdown timer until it ends or you exit the app.
Time events with the stopwatch
1. On your watch, open the Timers app .
2. In the Stopwatch section, tap Start.
3. Tap the play icon to start the stopwatch.
4. Tap the pause icon to stop.
5. Tap the reset icon to reset the stopwatch.
Keep track of elapsed time with the countdown timer
1. On your watch, swipe left or right from the clock face to find the Timers tile.
2. Tap a timer to start it.
1. If the duration you want isn’t listed, tap the menu icon Add Timer.
2. Swipe up or down to set the timer.
3. Tap the time to start the timer.
3. You can navigate away from the tile while the timer is running. Return to the
Timers tile to see the progress of your timer. Press the pause icon to pause
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the timer or the Xicon to cancel it. Your device flashes and vibrates when the
time allotted is done.
4. Tap the check mark icon or press the button to stop the alert.
For more information, see the related help article.
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Activity and Wellness
Sense 2 continuously tracks a variety of stats whenever you wear it, including hourly
activity, heart rate, and sleep. Data automatically syncs with the Fitbit app
throughout the day.
See your stats
Swipe left or right from the clock face to find Today's Activity tile, which shows your
daily Active Zone Minutes, steps, calories, distance traveled, and floors climbed. For
details and additional stats, tap the tile to open the Today app , which includes:
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Active Zone
Minutes
Active Zone Minutes earned today and the number of Active
Zone Minutes you're currently earning per minute
Calories burned Calories burned today and progress toward your daily goal
Distance Distance covered today and progress toward your daily goal
Exercise Number of days you met your exercise goal this week
Floors Floors climbed today and progress toward your daily goal
Heart rate Current heart rate and heart-rate zone
Hourly activity The number of hours today you met your hourly activity goal
Menstrual health Information on the current stage of your menstrual cycle, if
applicable
Mindfulness The number of mindfulness sessions you completed this week
and progress toward your goal
Oxygen
Saturation
Your most recent resting SpO2 average
Readiness Your daily readiness score
Resting heart
rate
Your resting heart rate
Sleep Sleep duration and sleep score
Steps Steps taken today and progress toward your daily goal
Stress
management
score
Your daily stress management score and the most recent mood
log you submitted today
To reorder the stats, press and hold a row, then drag it up or down to change its
position. Swipe a stat to the left to hide it. Tap Add stats at the bottom of the screen
to add back any stats you hid.
Find your complete history and other information detected by your watch in the
Fitbit app.
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Track a daily activity goal
Sense 2 tracks your progress toward a daily activity goal of your choice. When you
reach your goal, your watch vibrates and shows a celebration.
Choose a goal
Set a goal to help you get started on your health and fitness journey. To begin, your
goal is to take 10,000 steps per day. Choose to change the number of steps, or pick
a different activity goal depending on your device.
For more information, see the related help article.
Track progress toward your goal on Sense 2. For more information, see "See your
stats" on page43.
Track your hourly activity
Sense 2 helps you stay active throughout the day by keeping track of when you're
stationary and reminding you to move.
Reminders nudge you to walk at least 250 steps each hour. You feel a vibration and
see a reminder on your screen at 10 minutes before the hour if you haven't walked
250 steps. When you meet the 250-step goal after receiving the reminder, you feel
a second vibration and see a congratulatory message.
For more information, see the related help article.
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Track your sleep
Wear Sense 2 to bed to automatically track basic stats about your sleep, including
your time asleep, sleep stages (time spent in REM, light sleep, and deep sleep), and
sleep score (the quality of your sleep).
Sense 2 also tracks your estimated oxygen variation throughout the night to help
you uncover potential breathing disturbances, as well as your skin temperature to
see how it varies from your personal baseline and SpO2 levels, which estimate the
amount of oxygen in your blood.
To see your sleep stats, sync your watch when you wake up and check the Fitbit
app, or swipe left or right from your clock face to find the Sleep tile.
For more information, see the related help article.
Set a sleep goal
To start, you have a sleep goal of 8 hours of sleep per night. Customize this goal to
meet your needs.
For more information, see the related help article.
Get insights into your long-term sleep behaviors
With a Premium subscription, understand and take steps to help improve your
sleeping habits with a monthly sleep profile. Each month, wear your Fitbit device to
sleep for at least 14 days out of the month. On the 1st of each month, check the
Fitbit app to receive a breakdown of your sleep with 10 monthly metrics, along with
a sleep animal that reflects long-term trends in your sleep behaviors. See your sleep
animal on your device with the My Sleep Animal clock face.
For more information, see the related help article.
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Learn about your sleep habits
With a Fitbit Premium subscription, see more details about your sleep score and
how you compare to your peers, which can help you build a better sleep routine and
wake up feeling refreshed.
For more information, see the related help article.
Track your skin temperature changes
Sense 2 logs your skin temperature each night to show how it varies from your
personal baseline to help identify any changes from your baseline. Insight into your
night-time skin temperature variation can help you understand changes in your
body and spot trends. To view changes in your nightly sleeping skin temperature,
open the Fitbit app on your phone. From the Today tab , tap the Temperature
tile.
You see a graph of your skin temperature variations, along with any core
temperature readings you manually logged.
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With a Fitbit Premium subscription, see your skin temperature changes throughout
the night.
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Note that you must wear Sense 2 to sleep for 3 nights before you see your personal
skin temperature baseline.
For more information, see the related help article. Please note that this feature is not
available in all markets.
Manage stress
Track and manage your stress with mindfulness features.
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Use the EDA Scan app
The EDA Scan app on Sense 2 detects electrodermal activity which may indicate
your body's response to stress. Because your sweat level is controlled by the
sympathetic nervous system, these changes can show meaningful trends about how
your body responds to stress. Choose between a 2-minute quick scan or a guided
session.
1. Open the EDA Scan app .
2. Choose Quick Reset for a 2-minute scan or Guided Session for a scan lasting
up to 60 minutes.
3. If you chose Guided Session, a notification appears to open the Fitbit app.
Choose a mindfulness session, and tap Play Audio. Note: Premium subscribers
can access additional guided meditations in the Fitbit app.
4. Place your hand on top of the screen. Note that your palm must touch all 4
sides of the metal frame.
5. Remain still during the scan. Keep your hand on Sense 2 for at least 2 minutes.
6. If you remove your hand, the scan pauses. To resume, place your hand back on
the screen. To end the session, tap End.
7. Sense 2 buzzes after the scan is complete. Tap Log It to reflect on how you
feel, or tap Skip.
8. Swipe down to see the summary of your scan, including your number of EDA
responses, heart rate at the start and end of the session, and reflection if you
logged a reflection.
9. To see more details about your session, open the Fitbit app on your phone.
From the Today tab , tap the Mindfulness tile Your Journey.
For more information, see the related help article.
Practice guided breathing
The Relax app on Sense 2 provides personalized guided breathing sessions to
help you find moments of calm throughout the day. All notifications are
automatically disabled during the session.
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1. Open the Relax app .
2. The 2-minute session is the first option. Tap the gear icon to change the
duration of the session or turn off the optional vibration.
3. Tap the play icon or Start to begin the session. Follow the on-screen
instructions.
4. When the session ends, tap Log It to reflect on how you feel, or tap Skip to
skip this step.
5. View your summary, and tap Done to close the app.
After the exercise, a summary appears that shows your alignment (how closely you
followed the breathing prompt), your heart rate at the start and end of the session,
and how many days you completed a guided breathing session this week.
For more information, see the related help article.
Check your stress management score
Based on your heart rate, exercise, and sleep data, your stress management score
helps you see if your body is showing signs of stress on a daily basis. The score
ranges from 1 to 100, where a higher number means your body is showing fewer
signs of physical stress. To see your daily stress management score, wear your
watch to sleep, and open the Fitbit app on your phone the next morning. From the
Today tab , tap the Stress Management tile.
Log how you feel throughout the day to get a clearer picture of how your mind and
body respond to stress. With a Fitbit Premium subscription, see details about your
score breakdown.
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For more information, see the related help article.
Track your body responses
Sense 2 uses a continuous EDA sensor to identify patterns of stress. When your
watch detects a body response, you see a notification asking you to reflect on your
emotions.
To add your reflection:
1. Tap Open on the notification.
2. Tap the emotion that most closely fits your mood during the time specified or
tap Skip to dismiss the notification.
To see past body responses:
1. From the clock face, swipe right or left until you reach the Body responses tile.
The total time today your watch detected a body response is shown at the
top. Purple segments represent the duration of the body response.
2. Tap Check in to explore ways to manage your stress. Find shortcuts to the
EDA Scan app and Relax app, reflect on your current mood, start a walk in the
Exercise app, or learn more about body responses.
For details and a weekly summary of your top moods and body responses, check
the Stress Management tile in the Fitbit app. For more information, see the
related help article.
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Advanced health metrics
Know your body better with health metrics in the Fitbit app. This feature helps you
view key metrics tracked by your Fitbit device over time so that you can see trends
and assess what’s changed.
Metrics include:
lOxygen saturation (SpO2)
lSkin temperature variation
lHeart-rate variability
lResting heart rate
lBreathing rate
Note: This feature is not intended to diagnose or treat any medical condition and
should not be relied on for any medical purposes. It is intended to provide
information that can help you manage your well-being. If you have any concerns
about your health, please talk to a healthcare provider. If you believe you are
experiencing a medical emergency, call emergency services.
For more information, see the related help article.
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Exercise and Heart Health
Automatically track exercise or track activity with the Exercise app to see real-
time stats and a post-workout summary.
Check the Fitbit app to share your activity with friends and family, see how your
overall fitness level compares to your peers, and more.
Track your exercise automatically
Sense 2 automatically recognizes and records many high-movement activities
which are at least 15 minutes long. See basic stats about your activity in the Fitbit
app on your phone. From the Today tab , tap the Exercise tile .
Choose to turn on walk, run, or bike ride detect to automatically start the Exercise
app when your watch recognizes a walk, run, and bike ride. To turn this setting on:
1. Open the Exercise app .
2. Tap the walk, run, or bike ride option.
3. Swipe up and turn on Walk Detect,Run Detect, or Bike Detect. The next time
your watch detects this workout type, the Exercise app automatically opens.
Note that if you leave this setting off, basic stats about your walks, runs, and bike
rides are still recorded in the Fitbit app.
For more information, see the related help article.
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Track and analyze exercise with the Exercise app
Track specific exercises with the Exercise app on Sense 2 to see real-time stats,
including heart-rate data, calories burned, elapsed time, and a post-workout
summary on your wrist. For complete workout stats, and a workout intensity map if
you used GPS, tap the Exercise tile in the Fitbit app.
To track an exercise:
1. On Sense 2, open the Exercise app and swipe to find an exercise. Your
most recently used exercises appear at the top. Tap Other exercises to find a
complete list of exercises. You can also ask Alexa to open the Exercise app or
start tracking a workout. For more information, see "Interact with your voice
assistant" on page30.
2. Tap the exercise to choose it. If the exercise uses GPS, you can wait for the
signal to connect, or start the exercise and GPSwill connect when a signal is
available. Note that GPS can take a few minutes to connect.
3. Tap the play icon to begin the exercise, or swipe up to choose an exercise
goal or adjust the settings. For more information on the settings, see
"Customize your exercise settings" on the next page.
4. Tap or swipe the large stat to scroll through your real-time stats. To pause
your workout, press the button or swipe up and tap the pause icon . Press
the button again or tap the resume icon to resume your workout.
5. When you're done with your workout, swipe up and tapEnd. Your workout
summary appears.
6. Tap Resume to resume your workout, Start new to start a new workout, or
Done to close the summary screen.
Notes:
lIf you set an exercise goal, your watch alerts you when you’re halfway to your
goal and when you reach the goal.
lIf the exercise uses GPS, "GPSconnecting..." appears at the top of the screen.
When the screen says "GPSconnected"and Sense 2 vibrates, GPSis
connected. During the exercise, the GPSicon rotates if your watch is
55
searching for a GPSsignal. A stationary GPSicon indicates GPS is connected.
A red GPSicon indicates a GPSsignal couldn't be found.
Using built-in GPSimpacts your watch's battery life. When GPS tracking is turned
on, Sense 2 can track up to 12 hours of continuous exercise.
Customize your exercise settings
Customize settings for each exercise type on your watch. Settings include:
Always-on
Display
Keep the screen on during exercise
Auto-Stop Automatically pause a run, walk, or bike ride when you stop
moving
GPS Track your route using GPS
Heart Zone
Notifications
Receive notifications when you hit target heart-rate zones during
your workout.For more information, see the related help article
Interval Adjust the move and rest intervals used during interval training
Pool Length Set the length of your pool
Run
/Walk/Bike
Detect
Automatically open the exercise app when your watch detects a
run, walk, or bike ride.
Laps Receive notifications when you reach certain milestones during
your workout
Show Stats Choose what stats you want to see when tracking an exercise
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Settings vary based on the exercise. To adjust the settings for each type of exercise:
1. On Sense 2, open the Exercise app .
2. Tap the exercise you want to adjust.
3. Swipe up through the list of settings.
4. Tap a setting to adjust it.
5. When you're done, swipe down until you see the play icon .
Check your workout summary
After you complete a workout, Sense 2 shows a summary of your stats.
Check the Exercise tile in the Fitbit app to see additional stats and a workout
intensity map if you used GPS.
Check your heart rate
Sense 2 personalizes your heart-rate zones using your heart rate reserve, which is
the difference between your maximum heart rate and your resting heart rate. To
help you target the training intensity of your choice, check your heart rate and
heart-rate zone on your watch during exercise. Sense 2 notifies you when you enter
a heart-rate zone.
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Icon Zone Calculation Description
Below
Zone
Below
40%of
your heart
rate
reserve
Below the fat burn zone, your
heart beats at a slower pace.
Fat Burn
Zone
Between
40% and
59% of
your heart
rate
reserve
In the fat burn zone, you’re likely in
a moderate activity such as a brisk
walk. Your heart rate and
breathing might be elevated, but
you can still carry on a
conversation.
Cardio
Zone
Between
60% and
84% of
your heart
rate
reserve
In the cardio zone, you’re likely
doing a vigorous activity such as
running or spinning.
Peak
Zone
Greater
than 85% of
your heart
rate
reserve
In the peak zone, you’re likely
doing a short, intense activity that
improves performance and speed,
such as sprinting or high-intensity
interval training.
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Custom heart-rate zones
Instead of using these heart-rate zones, you can create a custom zone in the Fitbit
app to target a specific heart-rate range.
For more information, see the related help article.
Earn Active Zone Minutes
Earn Active Zone Minutes for time spent in the fat burn, cardio, or peak heart-rate
zones. To help you maximize your time, you earn 2 Active Zone Minutes for each
minute you’re in the cardio or peak zones.
1 minute in the fat burn zone = 1 Active Zone Minute
1 minute in the cardio or peak zones = 2 Active Zone Minutes
A few moments after you enter a different heart-rate zone during your exercise,
your watch buzzes so that you know how hard you’re working. The number of times
your watch vibrates indicates which zone you’re in:
1 buzz = fat burn zone
2 buzzes = cardio zone
3 buzzes = peak zone
To start, your weekly goal is set to 150 Active Zone Minutes. You’ll receive
notifications as you reach your goal.
For more information, see the related help article.
Receive heart-rate notifications
Stay informed when Sense 2 detects that your heart rate is outside of your high or
low thresholds when you appear to be inactive for at least 10 minutes.
59
To turn this feature off or adjust the thresholds:
1. From the Today tab in the Fitbit app on your phone, tap your profile
picture Sense 2 tile.
2. TapHigh &low heart rate.
3. Turn High heart rate notification or Low heart rate notification on or off, or tap
Custom to adjust the threshold.
View past heart-rate notifications, log possible symptoms and causes, or delete
notifications in the Fitbit app. For more information, see the related help article.
Check your daily readiness score
Understand what’s best for your body with the daily readiness score, available with
a Fitbit Premium subscription. Check the Fitbit app each morning to see your score,
ranging from 1 to 100, based on your activity, sleep, and heart-rate variability. A high
score means you’re ready to exercise, while a low score suggests you should focus
on recovery.
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When you check your score, you also see a breakdown of what impacted your
score, a personalized activity goal for the day, and recommended workouts or
recovery sessions.
To see your daily readiness score, wear your tracker to sleep, and open the Fitbit
app on your phone the next morning. From the Today tab , tap the Readiness
tile .
For more information, see the related help article.
View your cardio fitness score
View your overall cardiovascular fitness in the Fitbit app. See your cardio fitness
score and cardio fitness level, which shows how you compare to your peers.
In the Fitbit app, tap the Heart-rate tile and swipe left on your heart-rate graph to
see your detailed cardio fitness stats.
For more information, see the related help article.
Share your activity
After you complete a workout, open the Fitbit app to share your stats with friends
and family.
For more information, see the related help article.
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Contactless Payments
Sense 2 includes a built-in NFC chip, which lets you use your credit and debit cards
on your watch.
Use credit and debit cards
Set up Fitbit Pay or Google Pay in the Fitbit app, and use your watch to make
purchases in stores that accept contactless payments.
We’re always adding new locations and card issuers to our list of partners. To see if
your payment card works on your Fitbit device, see:
lFitbit Pay:fitbit.com/fitbit-pay/banks
lGoogle Pay:fitbit.com/global/us/technology/google-apps/banks
For more information about the transition from Fitbit Pay to Google Pay, see the
related help article.
Set up contactless payments
To use contactless payments, add at least 1 credit or debit card from a participating
bank to the Fitbit app. The Fitbit app is where you add and remove payment cards,
set a default card for your watch, edit a payment method, and review recent
purchases.
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. Tap the Google Pay tile.
3. Follow the on-screen instructions to add a payment card. In some cases, your
bank might require additional verification. If you're adding a card for the first
time, you might be prompted to set a 4-digit PIN code for your watch. Note
that you also need passcode protection enabled for your phone.
4. After you add a card, follow the on-screen instructions to turn on notifications
for your phone (if you haven't already done so)to complete the setup.
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Make purchases
Make purchases using your Fitbit device at any store that accepts contactless
payments. To determine if the store accepts contactless payments, look for the
symbol below on the payment terminal:
All customers except those in Australia:
1. Open the Google Wallet or Fitbit Pay app on your watch. Note that
you can quickly access your payment app by double-pressing the button on
your watch.
2. If prompted, enter your 4-digit watch PINcode. Your default card appears on
the screen.
3. To pay with your default card, hold your wrist near the payment terminal. To
pay with a different card, swipe to find the card you want to use, and hold
your wrist near the payment terminal.
Customers in Australia:
1. If you have a credit or debit card from an Australian bank, hold your watch
near the payment terminal to pay. If your card is from a bank outside of
Australia, or if you wish to pay with a card that is not your default card,
complete steps 1-3 in the section above.
63
2. If prompted, enter your 4-digit watch PINcode.
3. If the purchase amount exceeds $100 AU, follow the instructions on the
payment terminal. If prompted for a PIN code, enter the PIN code for your
card (not your watch).
When the payment succeeds, your watch vibrates and you see a confirmation on
the screen.
If the payment terminal doesn't recognize your Fitbit device, make sure the watch
face is near the reader and that the cashier knows you're using a contactless
payment.
For added security, you must wear Sense 2 on your wrist to use contactless
payments.
For more information, see the related help article.
Change your default card
Google Pay
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. Tap the Google Pay tile.
3. Tap the card you want to set as the default option.
4. Tap Details.
5. Tap Make default for contactless on watch.
Fitbit Pay
1. From the Today tab in the Fitbit app, tap your profile picture Sense 2
tile.
2. Tap the Wallet tile.
3. Find the card you want to set as the default option.
4. Tap Set as Default on Sense 2.
64
Pay for transit
Use contactless payments to tap on and off at transit readers that accept
contactless credit or debit card payments. To pay with your watch, follow the steps
listed in "Use credit and debit cards" on page62.
Pay with the same card on your Fitbit watch when you tap the transit reader at the
start and end of your trip. Make sure your device is charged before beginning your
trip.
65
Update, Restart, and Erase
Some troubleshooting steps may require you to restart your watch, while erasing it
is useful if you want to give Sense 2 to another person. Update your watch to
receive the latest firmware.
Update Sense 2
Update your watch to get the latest feature enhancements and product updates.
When an update is available, a notification appears in the Fitbit app. After you start
the update, follow the progress bars on Sense 2 and in the Fitbit app until the
update is complete. Keep your watch and phone close to each other during the
update.
Updating Sense 2 may be demanding on the battery. We recommend plugging your
watch into the charger before starting an update.
For more information, see the related help article.
Restart Sense 2
If you can’t sync Sense 2 or you have trouble with tracking your stats or receiving
notifications, restart your watch from your wrist:
To restart your watch, press and hold the button for 10 seconds until you see the
Fitbit logo on the screen, and then release the button.
Restarting your watch doesn't delete any data.
Sense 2 has small holes on the device for the altimeter, speaker, and microphone.
Don’t attempt to restart your device by inserting any items, such as paper clips, into
these holes as you can damage Sense 2.
66
Shutdown Sense 2
To turn off your watch, open the Settings app Shut down.
To turn on your watch, press the button.
For information about how to store Sense 2 long term, see the related help article.
Erase Sense 2
If you want to give Sense 2 to another person or wish to return it, first clear your
personal data:
On Sense 2, open the Settings app About Sense 2 Factory reset.
67
Troubleshooting
If Sense 2 isn't working properly, see our troubleshooting steps below.
Heart-rate signal missing
Sense 2 continuously tracks your heart rate while you're exercising and throughout
the day. If the heart-rate sensor on your watch has difficulty detecting a signal,
dashed lines appear.
If your watch doesn't detect a heart-rate signal, make sure you're wearing your
watch correctly, either by moving it higher or lower on your wrist or by tightening
or loosening the band. Sense 2 should be in contact with your skin. After holding
your arm still and straight for a short time, you should see your heart rate again.
For more information, see the related help article.
GPS signal missing
Environmental factors including tall buildings, dense forest, steep hills, and thick
cloud cover can interfere with your watch's ability to connect to GPS satellites. If
your watch is searching for a GPS signal during an exercise, you’ll see the GPSicon
rotating at the top of the screen.
68
For best results, wait for Sense 2 to find the signal before you start your workout.
If Sense 2 loses the GPSsignal during your workout, the GPSicon appears red .
Your watch will attempt to reconnect.
For more information, see the related help article.
Other issues
If you experience any of the following issues, restart your watch:
lWon't sync
lWon't respond to taps, swipes, or button press
lWon't track steps or other data
lWon't show notifications
For instructions, see "Restart Sense 2" on page66.
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General Info and Specifications
Sensors andComponents
Fitbit Sense 2 contains the following sensors and motors:
lMulti-path optical heart rate tracker
lElectrical sensor to measure skin conductance (cEDA)for stress detection
lMultipurpose electrical sensors compatible with the ECGapp and EDA Scan
app
lRed and infrared sensors for oxygen saturation (SpO2) monitoring
lGyroscope
lAltimeter, which tracks altitude changes
l3-axis accelerometer, which tracks motion patterns
lOn-wrist skin temperature sensor
lAmbient light sensor
lNFC
lBuilt-in GPSreceiver + GLONASS, which tracks your location during a workout
lVibration motor
lSpeaker
lMicrophone
lWiFi (deactivated, cannot be turned on)
Materials
The band that comes with Sense 2 is made of a flexible, durable elastomer material
similar to that used in many sports watches.
The housing and buckle on Sense 2 are made of aluminum. While aluminum can
contain traces of nickel, which can cause an allergic reaction in someone with nickel
sensitivity, the amount of nickel in all Fitbit products meets the European Union's
stringent Nickel Directive.
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Wireless technology
Sense 2 contains a Bluetooth 5.0 radio transceiver and NFCchip.
Haptic feedback
Sense 2 contains a vibration motor for alarms, goals, notifications, reminders, and
apps.
Battery
Sense 2 contains a rechargeable lithium-polymer battery.
Memory
Sense 2 stores your data, including daily stats, sleep information, and exercise
history, for 7 days. See your historical data in the Fitbit app.
Display
Sense 2 has a color AMOLED display.
Band size
Band sizes are shown below. Note that accessory bands sold separately may vary
slightly.
Small band Fits a wrist between 5.5 - 7.1 inches (140 mm - 180 mm)in
circumference
Large
band
Fits a wrist between 7.1 - 8.7 inches (180 mm - 220 mm)in
circumference
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Environmental conditions
Operating temperature 14° to 113° F
(-10° to 45° C)
Non-operating temperature -4° to 14° F
(-20° to -10° C)
113° to 140°F
(45° to 60° C)
Charging temperature 32° to 95° F
(0° to 35° C)
Water resistance Water resistant up to 50 meters
Maximum operating altitude 28,000 feet
(8,534 m)
Learn more
To learn more about your watch, how to track your progress in the Fitbit app, and
how to build healthy habits with Fitbit Premium, visit help.fitbit.com.
Return policy and warranty
Find warranty information and the fitbit.com return policy on our website.
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Regulatory and Safety Notices
Notice to the User: Regulatory content for certain regions can also be viewed on
your device. To view the content:
Settings About Sense 2 Regulatory info
USA:Federal Communications Commission(FCC)
statement
Model FB521:
FCC ID:XRAFB521
Notice to the User: The FCC ID can also be viewed on your device. To view the
content:
Settings About Sense 2 Regulatory info
Supplier's Declaration of Conformity
Unique Identifier: FB521
Responsible Party U.S. Contact Information
199 Fremont Street, 14th Floor
San Francisco, CA
94105
United States
877-623-4997
FCC Compliance Statement (for products subject to Part 15)
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
73
1. This device may not cause harmful interference and
2. This device must accept any interference, including interference that may
cause undesired operation of the device.
FCC Warning
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
lReorient or relocate the receiving antenna.
lIncrease the separation between the equipment and receiver.
lConnect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
lConsult the dealer or an experienced radio/TV technician for help.
This device meets the FCC and IC requirements for RF exposure in public or
uncontrolled environments.
Note:This device is intended only for use as a wrist-worn device
Canada:Industry Canada (IC)statement
Model/Modèle FB521
IC: 8542A-FB521
Notice to the User: The IC ID can also be viewed on your device. To view the
content:
74
Settings About Sense 2 Regulatory info
Avis à l'utilisateur: L'ID de l'IC peut également être consulté sur votre appareil. Pour
voir le contenu:
Paramètres À propos Sense 2 Informations réglementaires
This device meets the IC requirements for RF exposure in public or uncontrolled
environments.
Cet appareil est conforme aux conditions de la IC en matière de RF dans des
environnements publics ou incontrôlée
IC Notice to Users English/French in accordance with current issue of RSS GEN:
This device complies with Industry Canada license exempt RSS standard(s).
Operation is subject to the following two conditions:
1. this device may not cause interference, and
2. this device must accept any interference, including interference that may
cause undesired operation of the device.
Cet appareil est conforme avec Industrie Canada RSS standard exempts de licence
(s). Son utilisation est soumise à Les deux conditions suivantes:
1. cet appareil ne peut pas provoquer d’interférences et
2. cet appareil doit accepter Toute interférence, y compris les interférences qui
peuvent causer un mauvais fonctionnement du dispositif
European Union (EU)
Notice to the User:Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory Info
Frequency Bands and Power
75
Data given here is the maximum radio-frequency power transmitted in the
frequency band(s) in which the radio equipment operates.
Bluetooth 2400-2483.5 MHz < 13 dBm EIRP
NFC 13.56 MHz < 42 dBuA/m at 10m
Simplified EU Declaration of Conformity
Hereby, Fitbit LLC declares that the radio equipment type Model FB521 is in
compliance with Directive 2014/53/EU. The full text of the EU declaration of
conformity is available at the following internet address: www.fitbit.com/safety
Vereinfachte EU-Konformitätserklärung
Fitbit LLC erklärt hiermit, dass die Funkgerättypen Modell FB521 die Richtlinie
2014/53/EU erfüllen. Der vollständige Wortlaut der EU-Konformitätserklärungen
kann unter folgender Internetadresse abgerufen werden: www.fitbit.com/safety
Declaración UE de Conformidad simplificada
Por la presente, Fitbit LLC declara que el tipo de dispositivo de radio Modelo FB521
cumple con la Directiva 2014/53/UE. El texto completo de la declaración de
conformidad de la UE está disponible en la siguiente dirección de Internet:
www.fitbit.com/safety
Déclaration UE de conformité simplifiée
Fitbit LLC déclare par la présente que les modèles d’appareils radio FB521 sont
conformes à la Directive2014/53/UE. Les déclarations UE de conformité sont
disponibles dans leur intégralité sur le site suivant: www.fitbit.com/safety
Dichiarazione di conformità UE semplificata
Fitbit LLC dichiara che il tipo di apparecchiatura radio Modello FB521 è conforme
alla Direttiva 2014/53/UE. Il testo completo della dichiarazione di conformità UE è
disponibile al seguente indirizzo Internet: www.fitbit.com/safety
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Argentina
C-27776
Australia and New Zealand
Notice to the User: Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory info
Ghana
Notice to the User: Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory Info
Indonesia
76114/SDPPI/2021
3788
82058/SDPPI/2022
3788
77
82061/SDPPI/2022
3788
Israel
רפסמרושיאיטוחלאלשדרשמתרושקתהאוה.1285755
רוסאףילחהלתאהנטנאהתירוקמהלשרישכמהאלותושעלובלכיונישינכטרחא
Japan
Notice to the User: Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory info
201-220211
201-220279
Kingdom of Saudi Arabia
Notice to the User: Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory info
78
Malaysia
Notice to the User: Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory Info
Mexico
Notice to the User: Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory info
La operación de este equipo está sujeta a las siguientes dos condiciones:
1. Es posible que este equipo o dispositivo no cause interferencia perjudicial y
2. Este equipo o dispositivo debe aceptar cualquier interferencia, incluyendo la
que pueda causar su operación no deseada
IFT#: RCPFIFB22-1829
Morocco
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AGREE PAR L’ANRT MAROC
Numéro d’agrément: MR00032401ANRT2022
Date d’agrément: 25/03/2022
Nigeria
Connection and use of this communications equipment is permitted by the Nigerian
Communications Commission.
Oman
TRA/TA-R/13573/22
D172338
Paraguay
NR: 2022-04-I-0258
Philippines
Type Accepted
No:ESD-RCE-2230108
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Serbia
Singapore
Notice to the User: Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory info
South Korea
Notice to the User: Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory info
Taiwan
戶注 內容 內容
Sense 2 法規資訊
Translation:
Notice to the User: Regulatory content can also be viewed on your device.
Instructions to view content from your menu:
Settings About Sense 2 Regulatory info
81
低功率警語
使
使
經發現有干擾現象時應立即停用 使
法通信
Translation:
Low Power Warning:
For the low-power radio frequency equipment that has obtained the verification
certificate, the company, organization or user shall not change the frequency,
increase the power or change the features and functions of the original design
without approval. The use of low-power radio frequency equipment shall not affect
flight safety or interfere with legal communications. If any interference is detected,
the device should be disabled immediately and the interference removed before
continuing use. The aforesaid legal communication refers to the radio
communication operated in accordance with the provisions of the
Telecommunications Management Act. Low power radio frequency equipment
must accept interference from legal communication or radio wave radiated
electrical equipment for industrial, scientific and medical use.
使
內的
l
l 使
l
l使 銳物
Translation:
Battery warning:
This device uses a lithium-ion battery.
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If the following guidelines are not followed, the life of the lithium-ion battery in the
device may be shortened or there is a risk of damage to the device, fire, chemical
burn, electrolyte leakage and / or injury.
lDo not disassemble, puncture or damage the device or battery.
lDo not remove or try to remove the battery that the user cannot replace.
lDo not expose the battery to flames, explosions or other hazards.
lDo not use sharp objects to remove the battery.
Vision Warning
使
l使
l使30分鐘請休息10滿2幼兒不看螢幕2歲以 1
Translation:
Excessive use may damage vision
Warning:
lExcessive use may damage vision
Attention:
lRest for 10 minutes after every 30 minutes.
lChildren under 2 years old should stay away from this product. Children 2
years old or more should not see the screen for more than 1 hour a day.
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Taiwan RoHS
84
Thailand
United Arab Emirates
United Kingdom
Notice to the User: Regulatory content for this region can also be viewed on your
device. To view the content:
Settings About Sense 2 Regulatory Info
Simplified UK Declaration of Conformity
85
Hereby, Fitbit LLC declares that the radio equipment type Model FB521 is in
compliance with Radio Equipment Regulations 2017. The full text of the UK
declaration of conformity is available at the following internet address:
www.fitbit.com/legal/safety-instructions
Frequency Bands and Power
Data given here is the maximum radio-frequency power transmitted in the
frequency band(s) in which the radio equipment operates.
Bluetooth 2400-2483.5 MHz < 13 dBm EIRP
NFC 13.56 MHz < 42 dBuA/m at 10m
Vietnam
About the Battery
This unit contains a non-replaceable internal lithium-ion battery. The battery can
burst or explode, releasing hazardous chemicals. To reduce the risk of fire or burns,
do not disassemble, crush, puncture or dispose of in fire or water.
86
CAUTION: Risk of explosion if battery is replaced by an incorrect type. Dispose of
used batteries according to the instructions.
lThe battery must be recycled or disposed of properly
lUse the battery only in the specified equipment
lDo not leave the battery in an extremely high temperature environment that
may result in an explosion or the leakage of flammable liquid or gas
lDo not subject battery to extremely low air pressure that may result in an
explosion or the leakage of flammable liquid or gas
IP Rating
Notice to the User: Regulatory content can also be viewed on your device. To view
the content:
Settings About Sense 2 Regulatory Info
Model FB521 has a water resistance rating of IPX8 under IEC standard 60529, up to
a depth of 50 meters.
Model FB521 has a dust ingress rating of IP6X under IEC standard 60529 which
indicates the device is dust-tight.
Safety Statement
This equipment has been tested to comply with safety certification in accordance
with the specifications of: IEC 60950-1:2005, AMD 1:2009, AND2:2013, EN 60950-
1:2006 + A11:2009 + A1:2010 + A12:2011 + A2:2013, IEC 62368-1:2014, EN 62368-
1:2014 + A11:2017, IEC 62368-1: 2020 + A11: 2020, EN62368-1: 2018, EN IEC 62368-
1:2020 + A11:2020, BS EN 62368-1: 2014 + A11: 2017, BS EN IEC 62368-1:2020 +
A11:2020.
Regulatory Markings
Device regulatory markings can be viewed on your device by removing the band.
Markings are located in the band attach area.
87
Band Pocket View
88
©2022 Fitbit LLC. All rights reserved. Fitbit and the Fitbit logo are trademarks
or registered trademarks of Fitbit in the US and other countries. A more
complete list of Fitbit trademarks can be found at the Fitbit Trademark List.
Third-party trademarks mentioned are the property of their respective
83


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