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CX 400BT True Wireless

Superior sound. Tailored to you.

Powered by our leading audio technology

With passive noise cancellation, customizable controls, long battery life and a design made for all-day comfort, you’re in total control of an exceptional sound experience.

Better sound. Better control.

Delivers high-fidelity sound with deep bass, natural mids and a clear, detailed treble.

A wide range of audio codec support

Enjoy premium sound with any mobile device.

Never miss a beat

20 hours of battery life, plus a compact charging case.

A perfect, in-ear fit

The new CX 400BT True Wireless have an ergonomic design created for all-day comfortable wearing.

  • Sennheiser signature sound
  • Customizable touch controls
  • Up to 20 hours play time
  • Ergonomic design
  • Passive Noise Cancellation

Control, personalize, update and configure

Listen to your music the way you want with the Sennheiser Smart Control App.

Selectable sound modes

The Sennheiser Smart Control App, lets you tailor the sound experience to your travel playlist whether that be music, news, podcasts, or film.


Wearing style
true wireless stereo earphones
Frequency response (speaker)
5 Hz to 21 kHz
Ear coupling
Ear canal
Transducer size
7 mm

What's included

  • CX 400BT True Wireless Earbuds
  • Silicone ear adapter sets (XS, S, M, L)
  • Charging Case
  • USB-C Cable
  • Quick Guide & Safety Guide



Accessories & spare parts

We are committed to the longevity of our products.

  • CX 400BT Charging Case (black)
    CX 400BT Charging Case (black)
  • CX 400BT Charging Case (white)
    CX 400BT Charging Case (white)

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