Sennheiser CX 400BT True Wireless Earbuds - White

Code: 508901
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Manufacturer Sennheiser

Superior sound. Tailored to you.

Your day-to-day may change but your enjoyment of superior sound won’t. Powered by Sennheiser’s leading audio technology, the new CX 400BT True Wireless gives you total control over an exceptional sound experience. With intuitive customizable controls, long-lasting battery life and a design made for all-day comfort, they are the ideal, uncompromised choice for people that are passionate about great sound.

Better sound. Better control.

Whether you’re in the mood for calming tunes or crave some thrilling beats, the bespoke drivers of the new CX 400BT True Wireless deliver high-fidelity sound with deep bass, natural mids and a clear, detailed treble. Plus, you can personalize your listening experience with built-in equalizers to enjoy amazing sound quality that’s tailored to you.
Better sound. Better control.

Premium sound. Any device.

No matter where you stand – iOS or Android – you’ll always get to enjoy the outstanding sound quality of the new CX 400BT True Wireless earbuds. Thanks to our wide range of audio codec support including SBC, AAC and aptX, premium sound is guaranteed with any mobile device.
Premium sound. Any device.

Anytime. All the time.

Never miss a beat throughout the day with 20 hours of battery life – 7 hours on a single charge and a further 13 hours with the small, sleek and compact charging case. The new CX 400BT True Wireless earbuds are designed to ensure you get premium sound wherever you go.
Anytime. All the time.

Minimalist Design. Stylish comfort.

The new CX 400BT True Wireless is made for those who enjoy diving into a long playlist, a lively audiobook or a loving phone call. Available in black and white, they have an ergonomic design created for all-day comfortable wearing.
Minimalist Design. Stylish comfort.

Create your sound experience.

Pair your Sennheiser device with our Smart Control app.
Customize what you hear and how you interact with your Sennheiser device.
Create your sound experience.

Enhance what you hear.

Adjust our intuitive equalizer to perfect your listening experience.
Enhance what you hear.

Define your touch controls.

Control your music, voice assistants, and calls with adjustable touch controls you assign.
Define your touch controls.


  • Superior Sound - 7mm dynamic drivers and built-in equalizer
  • Customizable touch controls - Fully adaptable controls for music, calls and voice assistant
  • Codec Support - SBC, AAC and aptX: Wide range of Bluetooth audio codec support
  • Battery life - Up to 20h hours music playtime
  • Ergonomic design - Optimal comfort and secure fit with 4 ear adapter sizes
  • Voice Assistant Support - Enjoy speech-optimized calls and voice assistance

What's in the box?

  • CX 400BT True Wireless Earbuds
  • Silicone ear adapter sets (XS, S, M, L)
  • Charging Case
  • USB-C Cable
  • Quick Guide & Safety Guide
What's in the box?
Ear Coupling:
Closed acoustic
Travel, Mobile Devices
Optimized for:
Android Devices, iOS Devices
Sound Systems:
Frequency Response (Headphones):
5Hz - 21kHz
Sound Pressure Level (SPL):
107 dB (1 kHz / 1 mW)
Total Harmonic Distortion (THD):
< 0,08 % (1 kHz / 94 dB)
Transducer Principle:
Dynamic, 7 mm
Frequency Response (Microphone):
100Hz - 10kHz
Pick-up Pattern:
2 mic beamforming for ambient noise reduction, MEMS
Bluetooth Version:
Supported Profiles:
SBC, AAC, aptX™
Charging time:
Approx. 1.5 hrs for fully charged; After 10min charging 1 hrs music playtime; After 60min charging 5 hrs music playtime
Operating time:
Up to 7 hrs music playtime with earbuds; Up to 20 hrs overall music playtime with charging case
Battery Specification:
Built-in Lithium-ion rechargeable batteries left/right earbud: 55 mAh; Charging case: 420 mAh
Carrier frequencies:
2,402 MHz до 2,480 MHz
USB charging cable (USB-A to USB-C)
49g (both earbuds and charging case) 6g (single earbud) 37g (charging case)
Microphone, Volume Control

Sennheiser CX 400BT True Wireless - Introducing

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