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CX 350BT
In-Ear Wireless
Model: SEBT1
Instruction manual
Use the search function, the navigation (left) or the following links:
Start
“Product overview
“Getting started”
“Using the headphones”
“FAQ/If a problem occurs ...”
“Specifications”
Sennheiser electronic GmbH & Co. KG
Am Labor 1
30900 Wedemark
Germany
www.sennheiser.com
Version: 01/21 A02
Important safety instructions
2 | CX 350BT
Important safety instructions
Read this instruction manual carefully and completely before
using the product.
Always include this instruction manual when passing the product
on to third parties.
Do not use the product if it is obviously defective or makes loud,
unusual (whistling or beeping) noise.
Only use the product in environments where Bluetooth wireless
transmission is permitted.
Preventing damage to health and accidents
Protect your hearing from high volume levels. Permanent
hearing damage may occur when headphones are used
at high volume levels for long periods of time. Sennheiser
headphones sound exceptionally good at low and medium volume
levels.
The product generates stronger permanent magnetic
fields that could cause interference with cardiac pace-
makers, implanted defibrillators (ICDs) and other
implants. Always maintain a distance of at least 3.94"/10 cm bet-
ween the product component containing the magnet and the car-
diac pacemaker, implanted defibrillator, or other implant.
Do not insert the earphones too deep into your ears and never
insert them without ear adapters. Always remove the earphones
slowly and carefully from your ears.
Keep the product, accessories and packaging parts out of reach
of children and pets to prevent accidents. Swallowing and cho-
king hazard.
Do not use the product in an environment that requires your spe-
cial attention (e.g. in traffic or when performing skilled jobs).
Preventing damage to the product and malfunctions
Always keep the product dry and do not expose it to extreme tem-
peratures (hairdryer, heater, extended exposure to sunlight, etc.)
to avoid corrosion or deformation.
Use only attachments/accessories/spare parts supplied or
recommended by Sennheiser.
Clean the product only with a soft, dry cloth.
Safety instructions for Lithium rechargeable batteries
WARNING
If abused or misused, the rechargeable batteries may leak.
In extreme cases, they may even present a risk of:
•explosion,
fire development,
heat generation,
smoke or gas development.
Important safety instructions
CX 350BT | 3
Notes on data collection and processing and on firmware updates
This product stores individual settings such as the volume, the
sound profiles and the Bluetooth connection data of paired devices.
This data is required for the operation of the product and is not trans-
ferred to Sennheiser or companies commissioned by Sennheiser and
is not processed.
Using the “Sennheiser Smart Control” app, you can update the firm-
ware of the product for free via an Internet connection. If the device
on which the app is installed is connected to the Internet, the follow-
ing data is automatically transferred to and processed by Sennheiser
servers in order to provide and transfer suitable firmware updates:
hardware identifier, hardware revision number, firmware version of
the product, operating system type (Android, iOS) and version, ver-
sion of the app. The data will only be used as specified and will not
be stored permanently.
If you do not want this data to be transferred and processed, do not
connect to the Internet.
Intended use/Liability
These headphones have been designed as an accessory for Blue-
tooth compliant devices. They are intended for wireless audio com-
munication such as music playback and phone calls via Bluetooth
wireless technology.
It is considered improper use when the product is used for any appli-
cation not named in the corresponding product documentation.
Sennheiser does not accept liability for damage arising from misuse
or improper use of this product and its attachments/accessories.
Sennheiser is not liable for damages to USB devices that are not con-
sistent with the USB specifications. Sennheiser is not liable for
damages resulting from the loss of connection due to flat or overa-
ged rechargeable batteries or exceeding the Bluetooth transmission
range.
Before putting into operation, please observe the respective coun-
try-specific regulations.
Only use rechargeable batteries and chargers
recommended by Sennheiser.
Charge products with built-in rechargeable batteries at
ambient temperatures between 10 and 40°C/50 and
104°F.
Do not heat above 60 °C/140 °F, e.g. do not expose to
sunlight or throw into fire.
When not using the product for extended periods of
time, charge its built-in rechargeable battery regularly
(about every 3 months).
Switch rechargeable battery-powered products off after
use.
Dispose of defective products with built-in rechargeable
batteries at special collection points or return them to
your specialist dealer.
Package contents
4 | CX 350BT
Package contents
Online you can find:
this detailed instruction manual and additional information
(www.sennheiser.com/download)
the Sennheiser Smart Control app for getting to know the head-
phones (www.sennheiser.com/smartcontrol)
Headphones
USB charging cable with USB-C and
USB-A connector
Silicone ear adapter set in the following sizes:
XS, S, M (pre-mounted upon delivery) and L
Quick guide
Safety guide
You can find a list of accessories on the CX 350BT product
page at www.sennheiser.com. Contact your local Sennheiser
partner: www.sennheiser.com > “Service & Support”.
Product overview
CX 350BT | 5
Product overview
CX 350BT
Model: SEBT1
Earphones
Voice assistant button
LED
Volume + button (volume up)
Multi-function button
Volume - button (volume down)
USB-C socket for charging the rechargeable battery
Cover for USB-C socket
Microphone
*
ON OFF
PAIRING
MUSIC
TELEPHONE
7
M
1
4
3
2
5
Right R
Left L
7
5
9
8
6
Product overview
6 | CX 350BT
Overview of the LED indications of the
headphones
Notes on voice prompts
The headphones output voice prompts for the following functions.
LED Meaning; the headphones
lights up red are being charged
lights up blue are fully charged
flashes blue are switched on
flashes red-blue
approx. 1 min are in Bluetooth pairing mode
flashes blue Bluetooth pairing successful
flashes red Bluetooth pairing failed
flashes blue are connected to a device via Blue-
tooth
pulses red
approx. 3 sec
are not connected to a device via
Bluetooth or the connection has
been lost
flashes red rechargeable battery is almost
empty
flashes red are switched off
If the LED does not light up immediately during charging, clean
the charging socket and charge the headphones until the LED
lights up again (> 9).
Voice prompt Meaning/headphones
“Power on” are switched on
“Power off” are switched off
“Device (1) (2) connected” are connected to device 1 or 2
“Lost connection” are not connected via Bluetooth
“Pairing” are in Bluetooth pairing mode
“Pairing successful” Bluetooth pairing successful
“Pairing failed” Bluetooth pairing failed
“Call rejected” incoming call rejected
“Call ended” call ended
Product overview
CX 350BT | 7
“Mute on” Microphone is muted, active call is
put on hold
“Mute off” Microphone is reactivated
“Recharge headset” Rechargeable battery is empty.
Recharge the headphones.
“Volume min” volume set to minimum
“Volume max” volume set to maximum
Voice prompt Meaning/headphones
Getting started
8 | CX 350BT
Getting started
1. Charging the rechargeable battery
The headphones' rechargeable battery is not fully charged upon deli-
very. Before using the headphones for the first time, charge the
rechargeable battery for a complete charging cycle without inter-
ruption (> 9).
2. Installing the Smart Control app on your
smartphone
The Sennheiser Smart Control app allows you to use all functions
and settings of the headphones and to e.g. adjust the sound to your
liking using the equalizer (> 12).
3. Connecting the headphones to a Bluetooth
device
Connect the headphones to your smartphone via Bluetooth (> 10).
4. Selecting suitable ear adapters for optimum
fit of the headphones
The perceived sound quality and bass performance depends to a
large extent on the correct fit of the headphones in the ear.
Test which ear adapter size gives you the best sound quality and
the best wearing comfort.
You can choose between 4 different ear adapters in size XS, S, M
and L.
The ear adapters must fit snugly in the ear canal and completely seal
your ears (> 12).
USB-C USB-A
4s
Hold
XS SM L
M
M
Using the headphones
CX 350BT | 9
Using the headphones
Information on the rechargeable battery
and the charging process
The headphones have a built-in rechargeable battery. A complete
charging cycle takes approx. 2.5 hours. Before using the headphones
for the first time, charge the rechargeable battery for a complete
charging cycle without interruption.
When the headphones are being charged, the LED lights up (> 6).
When the battery charge drops to a critical level, a voice prompt asks
you to recharge the headphones (“Recharge headset”).
Sennheiser recommends using the supplied USB cable and a compa-
tible standard USB power supply for charging the headphones.
Charging the headphones' rechargeable
battery
1. Connect the USB-C connector of the USB cable to the USB-C
socket of the headphones.
2. Connect the USB-A connector to a corresponding socket of a USB
power source (to be ordered separately). Make sure that the USB
power source is connected to the power supply system.
The charging process of the headphones begins. The LED dis-
plays the charge status:
LED Meaning
flashes red Rechargeable battery is being charged
(charge level is very low)
lights up red Rechargeable battery is being charged
(charge level approx. 50%)
lights up
purple
Rechargeable battery is being charged
(charge level approx. 75%)
lights up blue Rechargeable battery is fully charged
USB-A
USB-C
2,5 HRS
Using the headphones
10 | CX 350BT
Connecting the headphones to a
Bluetooth device
To be able to use the Bluetooth wireless connection, you must regis-
ter both devices (headphones and e.g. smartphone) via the device
settings of your smartphone. This process is called pairing.
If operation differs from the steps mentioned, also refer to the inst-
ruction manual of the Bluetooth device you are using.
Information on the Bluetooth wireless
connection
The headphones are compatible with Bluetooth 5.0.
If your audio source supports one of the following high-resolution
audio encoding methods, music is automatically played in high audio
quality: aptX, aptX LL or AAC. Otherwise the headphones will play
your music in normal audio quality (SBC).
Paired devices establish the Bluetooth wireless connection immedi-
ately after switch-on and are ready for use.
On switch-on, the headphones automatically try to connect to the
last two connected Bluetooth devices. The headphones can save the
connection profiles of up to eight Bluetooth devices with which they
have been paired.
If you pair the headphones with the ninth Bluetooth device, the saved
connection profile of the least used Bluetooth device will be over-
written. If you want to re-establish a connection with the overwritten
Bluetooth device, you have to pair the headphones again.
If you switch on the headphones for the first time, they auto-
matically switch to pairing mode.
Paired and connected Bluetooth device
Paired Bluetooth device (currently not connected)
Using the headphones
CX 350BT | 11
Pairing the headphones with a Bluetooth
device
1. Switch the headphones on (> 13) and place them close to the
Bluetooth device (max. 20 cm).
2. Press and hold the multi-function button for 5 seconds until you
hear the voice prompt “Pairing”.
The LED flashes blue and red. The headphones are in pairing
mode.
3. Activate Bluetooth on your Bluetooth device.
4. Via the menu of your Bluetooth device, start the search for new
Bluetooth devices.
All active Bluetooth devices in the proximity of your Bluetooth
device are displayed.
5. From the list of found Bluetooth devices, select “CX 350BT”. If
necessary, enter the default pin code “0000”.
If pairing was successful, you hear the voice prompts “Pairing
successful” and “Device (1) connected”. The LED flashes blue 3x.
Disconnecting the headphones from a
Bluetooth device
Via the menu of your Bluetooth device, disconnect the connection
to the headphones.
The headphones are disconnected from the Bluetooth device.
You hear the voice prompt “Lost connection”. The headphones
then search for other paired devices. If no device is found within
5 minutes, the headphones switch to idle mode.
If no connection is established within 5 minutes, pairing mode
is terminated and the headphones switch to idle mode. If
necessary, repeat the steps described above.
“Pairing“
12
34 5
< 20 cm
ON
“Device (1)
connected“
“Pairing
successful“
3x
3x
ON
3s
Hold
5s
Hold
Menu
Bluetooth on
Bluetooth off
Menu
Add Device
CX 350BT
Using the headphones
12 | CX 350BT
Installing the Smart Control app
To make full use of all the settings and functions of the headphones,
you need to have the free Sennheiser Smart Control app installed on
your smartphone.
Download the app from the App Store or Google Play and install it on
your smartphone. Alternatively, you can use your smartphone to
scan the following QR code or to call up the following Internet site:
www.sennheiser.com/smartcontrol
Connect your smartphone to the headphones via Bluetooth (> 10).
Start the Smart Control app.
Follow the instructions in the app.
Selecting suitable ear adapters for
optimum fit of the headphones
The perceived sound quality and bass performance of the headpho-
nes depends to a large extent on their correct fit in the ear.
Pull the ear adapter away from the in-ear sound tunnel.
Mount the new ear adapter to the in-ear sound tunnel. Ensure that
it locks into place.
Test which ear adapter size gives you the best sound quality and
the best wearing comfort.
You can choose between 4 different ear adapters in size XS, S, M and
L. The ear adapters must fit snugly in the ear canal and completely
seal your ears.
“Sennheiser Smart Control”
XS S
M L
Using the headphones
CX 350BT | 13
Inserting the earphones into the ears
Put the cable around your neck.
Assign the right earphone to your right ear and the left earphone
to your left ear.
Press the earphones lightly into the ear canal.
Switching the headphones on
Press the multi-function button for 3 seconds.
The headphones switch on. You hear the voice prompt “Power on”
and the LED display flashes blue 3x.
If a paired Bluetooth device is within the transmission range, you
hear the voice prompt “Device (1) connected”. The LED flashes
blue 3x.
If the earphones fit too loose in the ear canal and fall out easily:
Try larger ear adapters.
If you feel immediate pressure when wearing the earphones:
Try smaller ear adapters.
R
WARNING
Danger of hearing damage due to high volume levels!
Listening at high volume levels can lead to permanent
hearing defects.
Before putting the headphones on, adjust the volume
to a low level (> 15).
Do not continuously expose yourself to high volume
levels.
Make sure that Bluetooth is already activated on your Blue-
tooth device when switching on the headphones.
“Power on
3x
3x
3s
Hold
ON
“Device (1)
connected“
Using the headphones
14 | CX 350BT
Switching the headphones off
Press the multi-function button for 3 seconds.
You hear the voice prompt “Power off” and the LED flashes red 3x.
Retrieving information on the battery
charge status
When the headphones are connected to your Bluetooth device, the
battery charge status can be displayed on the screen of your smart-
phone (depending on the device and operating system used).
You can check the battery charge level of your headphones manually
by pressing the volume - button 1x. You hear the voice prompt “More
than xx % battery left”.
If Bluetooth is activated and the headphones cannot find a
paired Bluetooth device within a few minutes, you hear the
voice prompt “Lost connection”. The LED flashes red. The
headphones switch to standby mode.
The headphones automatically switch to idle mode if no paired
Bluetooth device can be found within 5 minutes. You can wake
up the headphones from idle mode by pressing the multi-func-
tion button for approx. 3 seconds.
“Power off“
3x
3s
Hold
OFF
Voice prompt Meaning
“Recharge headset” The rechargeable battery is empty.
Recharge the rechargeable battery (>
9).
In addition, the LED flashes red.
“More than xx % battery
left”
The remaining battery charge is
displayed as a percentage.
Using the headphones
16 | CX 350BT
Controlling music playback
The music playback functions are only available when the headpho-
nes and the device are connected via Bluetooth. Some smartphones
or music players may not support all functions.
Playing/pausing music
Press the multi-function button 1x.
Playing the next track
Quickly press the multi-function 2x.
Playing the previous track
Quickly press the multi-function 3x.
Making phone calls using the headphones
The call functions are only available when the headphones and the
smartphone are connected via Bluetooth. Some smartphones may
not support all functions.
The multi-function button allows you to control the call functions.
Making a call
Dial the desired number on your smartphone.
If your smartphone does not automatically transfer the call to the
headphones, select “CX 350BT” as the output device on your
smartphone (see the instruction manual of your smartphone if
necessary).
Multi-function button Function
Press 1x Plays or pauses music
Multi-function button Function
Press 2x Plays the next track in the playlist
Multi-function button Function
Press 3x Plays the previous track in the playlist
16


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