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Smart: Records key points where you change direction, pace, or
heart rate. Your activity record is smaller, allowing you to
store more activities on the device memory.
Every Second: Records points every second. It creates a very
detailed record of your activity and increases the size of the
activity record.
Device Information
Charging the Device
WARNING
This device contains a lithium-ion battery. See the Important
Safety and Product Information guide in the product box for
product warnings and other important information.
NOTICE
To prevent corrosion, thoroughly clean and dry the contacts and
the surrounding area before charging or connecting to a
computer.
Refer to the cleaning instructions in the appendix.
1
Plug the USB cable into a USB port on your computer.
2
Align the charger posts with the contacts on the back of the
device, and connect the charging clip
À
securely to the
device.
3
Charge the device completely.
4
Press
Á
to remove the charger.
Specifications
Forerunner Specifications
Battery type Rechargeable, built-in lithium-ion battery
Forerunner 230 battery
life, watch mode
Up to 12 wk.
Up to 11 wk. with activity tracking
Up to 5 wk. with activity tracking and
smartphone notifications
Forerunner 230 battery
life, activity mode
Up to 16 hr. in GPS mode
Up to 12 hr. in GPS + GLONASS mode
Forerunner 235 battery
life, watch mode
Up to 9 wk.
Up to 8 wk. with activity tracking
Up to 4 wk. with activity tracking and
smartphone notifications
Up to 9 days with activity tracking,
smartphone notifications, and wrist-based
heart rate
Forerunner 235 battery
life, activity mode with
wrist-based heart rate
Up to 11 hr. in GPS mode
Up to 9 hr. in GPS + GLONASS mode
Water rating 5 ATM*
Operating temperature
range
From -20º to 60ºC (from -4º to 140ºF)
Charging temperature
range
From 0º to 45ºC (from 32º to 113ºF)
Radio frequency/
protocol
2.4 GHz
ANT+ wireless communications
protocol
Bluetooth Smart wireless technology
*The device withstands pressure equivalent to a depth of 50 m.
For more information, go to www.garmin.com/waterrating.
Heart Rate Monitor Specifications
Battery type User-replaceable CR2032, 3 volts
Battery life Up to 4.5 yr. at 1 hr./day
Water resistance 3 ATM*
NOTE:
This product does not transmit heart
rate data while swimming.
Operating temperature
range
From -5° to 50°C (from 23° to 122°F)
Radio frequency/
protocol
2.4 GHz ANT+ wireless communications
protocol
*The device withstands pressure equivalent to a depth of 30 m.
For more information, go to www.garmin.com/waterrating.
Device Care
NOTICE
Avoid extreme shock and harsh treatment, because it can
degrade the life of the product.
Avoid pressing the keys under water.
Do not use a sharp object to clean the device.
Avoid chemical cleaners, solvents, and insect repellents that can
damage plastic components and finishes.
Thoroughly rinse the device with fresh water after exposure to
chlorine, salt water, sunscreen, cosmetics, alcohol, or other
harsh chemicals. Prolonged exposure to these substances can
damage the case.
Do not store the device where prolonged exposure to extreme
temperatures can occur, because it can cause permanent
damage.
Cleaning the Device
NOTICE
Even small amounts of sweat or moisture can cause corrosion
of the electrical contacts when connected to a charger.
Corrosion can prevent charging and data transfer.
1
Wipe the device using a cloth dampened with a mild
detergent solution.
2
Wipe it dry.
After cleaning, allow the device to dry completely.
Caring for the Heart Rate Monitor
NOTICE
You must unsnap and remove the module before washing the
strap.
A build up of sweat and salt on the strap can decrease the ability
of the heart rate monitor to report accurate data.
Go to www.garmin.com/HRMcare
for detailed washing
instructions.
Rinse the strap after every use.
Machine wash the strap after every seven uses.
Do not put the strap in a dryer.
When drying the strap, hang it up or lay it flat.
To prolong the life of your heart rate monitor, unsnap the
module when not in use.
User Replaceable Batteries
WARNING
Do not use a sharp object to remove batteries.
Keep the battery away from children.
10 Device Information
14


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