Your data. Your choice.

If you select «Essential cookies only», we’ll use cookies and similar technologies to collect information about your device and how you use our website. We need this information to allow you to log in securely and use basic functions such as the shopping cart.

By accepting all cookies, you’re allowing us to use this data to show you personalised offers, improve our website, and display targeted adverts on our website and on other websites or apps. Some data may also be shared with third parties and advertising partners as part of this process.

Legal noticePrivacy notice

Sennheiser CX 400BT black

ANC, Wireless
Price in EUR including VAT
Ratings
BrandMore from Sennheiser
Test reportsVery good based on 7 tests
Delivered between Fri, 5.12. and Thu, 18.12.
Only 1 piece in stock at supplier
free shipping

Noise cancelling2

Product details

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.

Superior sound. Immerse yourself in amazing sound quality thanks to Sennheiser’s unique 7mm dynamic audio drivers and personalize your audio experience with the built-in equalizer and the Sennheiser Smart Control app.

Customizable controls. Manage your music, make calls, or trigger the voice assistant with customizable touch-sensitive technology built into both earbuds.

Codec support. Enjoy outstanding sound quality no matter your mobile device with our wide range of audio codec support including AAC, aptX, and SBC.

Battery life. Experience non-stop playtime with 20 hours of battery life – 7 hours on a single charge and a further 13 hours via the charging case.

Ergonomic design. Dive into your favorite music for as long as you like with an ergonomic design made for all-day wearing.

Key specifications

Application range
General
Headphone type
True Wireless headphones
Signal transmission
Wireless
Noise cancelling
ANC
Item number
37400807

General information

Manufacturer
Sennheiser
Category
Headphones
Manufacturer no.
508900
Release date
8.8.2023

Colour

Colour
Black
Exact colour description
Black

Application range

Application range
General

Headphone properties

Output
Stereo
Noise cancelling
ANC
Music control
touchpad remote control
Signal transmission
Wireless

Headphone type

Headphone type
True Wireless headphones
Fit
In Ear
Converter principle
Dynamic
Membrane size
7 mm

Audio properties

Frequency range
5 - 21000 Hz

Connections

Connections base/transmitter
USB-C

Bluetooth features

Bluetooth version
5.1
Bluetooth profiles
A2DP, AVRCP, HFP, HSP

Battery properties

Charging input
USB-C
Supported charging power
3 – 3 W

Voluntary climate contribution

CO₂-Emission
Climate contribution

Scope of delivery

Scope of delivery
without charger

Legal Notice

Product Safety

Supports chargers from 3 to 3 watts.

14-day cancellation right
30-day right of return if unused
24 Months statutory warranty

Compare products

Goes with

Reviews & Ratings

Statutory warranty score

How often does a product of this brand in the «Headphones» category have a defect within the first 24 months?

Source: Galaxus
  • 88.JBL
    4 %
  • 89.JLab Audio
    4,1 %
  • 90.Sennheiser
    4,2 %
  • 90.Soundpeats
    4,2 %
  • 92.OPPO
    4,3 %

Statutory warranty case duration

How many working days on average does it take to process a warranty claim from when it arrives at the service centre until it’s back with the customer?

Source: Galaxus
  • 72.Bose
    6 days
  • 73.Denon
    7 days
  • 74.Sennheiser
    8 days
  • 75.Shokz
    10 days
  • 75.Shure
    10 days

Return rate

How often is a product of this brand in the «Headphones» category returned?

Source: Galaxus
  • 81.Beats
    4 %
  • 83.OneOdio
    4,1 %
  • 83.Sennheiser
    4,1 %
  • 85.Defunc
    4,2 %
  • 86.FiiO
    4,3 %
Source: Galaxus

Translation: machine translated
Overall ratingVery good87/100
Very good88/100
CHIP OnlineSingle testReleaseMarch 2022
  • PositiveTop sound
  • PositiveExtensive customisation thanks to app
  • PositiveVery good price
  • NegativePurposeful processing
  • NegativeManageable equipment

In testing, the Sennheiser CX400BT TW in-ear headphones prove that they are in no way inferior to the higher-priced Momentum True Wireless 2, at least in terms of sound. The sound benefits from clear and full reproduction, combined with rich bass and present voices. The workmanship is not particularly high-quality, but the controls and the manufacturer's app are extremely comprehensive...

Very good98/100
MAC LIFE Logo
MAC LIFESingle testReleaseJune 2021
  • PositiveSound
  • PositivePrice/Performance
  • PositiveConfiguration options
  • NegativeClunky transport/loading box
  • NegativeTouch control sometimes tedious

We have not yet come across better in-ears at a comparable price.

Very good94/100
Audio TestSingle testReleaseMarch 2021
  • PositiveBattery life
  • PositiveSound
  • PositiveDesign

    It is true that the CS 400 BT True Wireless does without some of the features of the Momentum True Wireless premium collection. However, no compromises have been made in the essential sound-producing components. Therefore, the newcomer is significantly cheaper, but no less powerful...

    Very good83/100
    Rank 2 out of 30Stiftung Warentest30 Bluetooth-KopfhörerReleaseFebruary 2021

    Wireless headphones tested Better without cables, say many headphone buyers. Bluetooth headphones do not require a connection cable - there are no more trip hazards. There are models in the classic design of a headphone with a headband and, as an alternative, in-ear headphones - tiny in size, but not in sound...

    Very good88/100
    PC Magazin Logo
    PC MagazinSingle testReleaseFebruary 2021

    Overall, Sennheiser's CX 400BT are convincing in the areas of sound, endurance and wearing comfort. However, for 200 euros, a few features are missing in this price range.

    Very good80/100
    connect Logo
    connectSingle testReleaseJanuary 2021
    • PositiveBalanced and neutral sound with little distortion
    • Positivegood workmanship
    • Positiveappealing design
    • Positivehigh wearing comfort
    • PositiveGood and intuitive operation
    • PositiveIntegrated equalizer