From the manufacturer
Better sound. Better control.
Whether you’re in the mood for calming tunes or crave some thrilling beats, the bespoke drivers of the CX 400BT True Wireless deliver high-fidelity sound with deep bass, natural mids and a clear treble. Plus, you can personalize your listening experience with the Smart Control App, which lets you play with built-in equalizers for an even more amazing sound quality.
Tune in. Switch off.
For those who always like to be on the ball, on the beat and on-call, the customizable touch controls on both earbuds make it easy to enjoy a smarter and more connected lifestyle. The touch-sensitive interfaces provide fast access to voice assistants such as Siri and Google Assistant, as well as intuitive control of your music and calls.
Premium sound. Any device.
No matter where you stand – iOS or Android – you’ll always get to enjoy the CX 400BT True Wireless earbuds. Thanks to our wide range of audio codec support including SBC, AAC and aptX, premium sound is guaranteed and with any mobile 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 CX 400BT True Wireless earbuds are designed to ensure you get premium sound wherever you go.
Minimalist Design. Stylish comfort.
The CX 400BT True Wireless is made for those who enjoy diving into a long playlist, a lively audio-book or a loving phone call. Available in black and white they have an ergonomic design created for all-day comfortable wearing.
CX 400BT True Wireless
Black & White
Black & White
7h + 13h (earbud + charging case)
7h + 21h (earbud + charging case)
Active Noise Cancellation
Voice assistant access
Internal EQ / Custom presets
Splash Resistant (IPX4)
Audio quality is our top priority: Experience great sound with a 7 millimeter dynamic driver and a wide range of Bluetooth codec support
Long battery life (20 hours) and comfortable wearing: Get up to 20 hours of music playtime with one charge – The ergonomic design offers optimal comfort and secure fit with 4 ear adapter sizes
Personalize to your everyday needs: Fully adaptable controls for music, calls and voice assistant – Built-in audio equalizer adapts the sound to your personal preferences
Full digital control with our app: Our Smart Control app for iOS / Android allows all of the earphone functionalities to be modified to your personal choice
Enjoy outstanding sound quality no matter your mobile device or your surroundings with our wide range of audio codec support including AAC, aptX, SBC as well as passive Noise Cancelling
Sennheiser uses decades of expertise to drive the world of audio technology forward with every product – for new, unique sound experiences
Included components: CX 400BT True Wireless, Charging case, USB-C charging cable, Silicone ear adapter sets (in size XS/S/M/L)