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Sennheiser CX 400BT True Wireless Headphones - Black

In stock. Limit 1 per customer.
Ships from China.
Fees for brokerage and duty included in price.
  • 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
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Sennheiser CX 400BT True Wireless Headphones

CX 400BT True Wireless
Superior sound. Tailored to you.

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.

Your sound. Your focus

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.

Comfortable all-day listening

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.

Intuitive to your needs

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.

Comfortable all-day listening

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.

Customizable Touch Controls

Customizable Touch Controls

Built-in Equalizer

Built-in Equalizer

Active Noise Cancellation

7mm dynamic driver

Transparent Hearing

20 hour battery life

Smart Control App

Smart Control App

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.

Smart Control App

Smart Control App

Enhance what you hear.

Adjust our intuitive equalizer to perfect your listening experience.

Smart Control App

Smart Control App

Define your touch controls

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

Smart Control App

Smart Control App

Decide what you hear.

Use the transparent hearing settings to determine how much of ambient noise you want to hear.


Sennheiser Smart Control is a free app and compatible with most iOS and Android systems.
This App is available in 8 languages including German, English, French, Spanish, Russian, Korean, Japanese and Mandarin.

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Android, Google Play and the Google Play logo are trademarks of Google LLC.

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Apple, the Apple logo and iPhone are trademarks of Apple Inc., registered in the U.S. and other countries and regions. App Store is a service mark of Apple Inc.

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

Avaiable colors: Black, White

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Warranty & Returns

Warranty, Returns, And Additional Information


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details

Return Policies