Page 1
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: 12/20 A02...
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. ▷...
Page 3
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 dam-...
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) You can find a list of accessories on the CX 150BT product page at www.sennheiser.com.
Product overview Product overview Headphones CX 150BT Model: SEBT2 Right Left PAIRING MUSIC TELEPHONE Earphones 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 CX 150BT | 5...
Page 6
Product overview Overview of the LED indications of the headphones Meaning; the headphones lights up red are being charged lights up blue are fully charged flashes blue are switched on flashes red-blue are in Bluetooth pairing mode approx. 1 min flashes blue Bluetooth pairing successful flashes red...
Page 7
Product overview Voice prompt Meaning/headphones “Pairing successful” Bluetooth pairing successful “Pairing failed” Bluetooth pairing failed “Call rejected” incoming call rejected “Call ended” call ended “Mute on” Microphone is muted, active call is put on hold “Mute off” Microphone is reactivated “Recharge headset”...
Getting started Getting started 1. Charging the rechargeable battery The headphones' rechargeable battery is not fully charged upon delivery. Before using the headphones for the first time, charge the rechargeable battery for a complete charging cycle without interrup- tion (> USB-C USB-A 2.
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 com- patible standard USB power supply for charging the headphones. Charging the headphones' rechargeable...
Page 10
Using the headphones 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 instruction manual of the Bluetooth device you are using.
Page 11
Using the headphones Pairing the headphones with a Bluetooth device 1. Switch the headphones on (> 13) and place them close to the Blue- tooth device (max. 20 cm). 2. Press and hold the multi-function button for 5 seconds until you hear the voice prompt “Pairing”.
Page 12
Using the headphones Installing the Smart Control app “Sennheiser Smart Control” The Smart Control app allows you to get to know your headphones even better. 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...
Page 13
Using the headphones 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. If the earphones fit too loose in the ear canal and fall out easily: ▷...
Page 14
Using the headphones 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. Switching the headphones off Hold “Power off“...
Page 15
Using the headphones Adjusting the volume 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 and before toggling between audio sources, adjust the volume to a low level.
Page 16
Using the headphones Controlling the music playback The music playback functions are only available when the head- phones and the device are connected via Bluetooth. Some smart- phones or music players may not support all functions. Playing/pausing music ▷ Press the multi-function button once. Multi-function button Function Press 1x...
Page 17
Using the headphones Accepting/rejecting/ending a call If your headphones are connected to a smartphone and you receive a call, you hear a ring tone in the headphones. If you are playing music when you receive a call, the music pauses until you end the call.
Clean the product only with a soft, dry cloth. Replacing the ear adapters For reasons of hygiene, you should replace your ear adapters from time to time. Spare ear adapters are available from your Sennheiser partner. 1. Pull the ear adapter away from the in-ear sound tunnel.
Page 19
If a problem occurs that is not listed in the FAQ section or if the prob- lem cannot be solved with the proposed solutions, please contact your Sennheiser partner for assistance. To find a Sennheiser partner in your country, search at www.sennheiser.com > “Service & Support”. Leaving the Bluetooth transmission range Wireless calling and streaming are only possible in the Bluetooth transmission range of your smartphone.
Manufacturer Declarations Manufacturer Declarations Warranty Sennheiser electronic GmbH & Co. KG gives a warranty of 24 months on this product. For the current warranty conditions, please visit our website at www.sennheiser.com or contact your Sennheiser partner. In compliance with the following requirements •...