Sennheiser CX 400BT True Wireless - Black

  • 5 0
  • 4 1
  • 3 0
  • 2 0
  • 1 0
Read 1 review
FREE delivery with Click & Collect on orders £30 or more (product exclusions apply), and free returns. Find out more about Click & Collect


Click and Collect
Free delivery with Click & Collect on orders £30 or more.
Orders under £30 carry a £3 delivery charge

Orders will be delivered to one of the 1000s of Collect+ stores or Post Offices (on selected lines only) and usually delivered the next working day if ordered before 10pm (Sun - Fri).*

Exclusions apply, determined by size, weight or whether delivered direct from one of our suppliers.

Standard delivery £3.99
Delivered to your home or nominated address, usually delivered the next working day if ordered before 10pm*

Nominated day delivery £4.99
Delivered to your home or nominated address on a day of your choice

*Some promotional items can take up to 10 days


Returns are free and easy under our 28 day home approval guarantee using the following services:

Return your item at your local Collect + store*
Return item through your local Post Office*

For large and bulky items please call our customer service team on 0800 11 00 00

*Maximum weight 10kg

View product information
  • 1
  • 2
  • 3
    Very Protect - Replace Insurance

    Please select item options before Very Protect - Replace Insurance.

    Find out more

    Check it's right for you

    Scroll down to read and confirm below if this is right for you.

    Very can help protect your purchases when it matters most.

    Would you need a replacement if this product stopped working? Very Protect - Replace covers accidental damage from day one and breakdown after the manufacturer’s warranty ends.

    Would you be lost without this product? If it breaks, we’ll aim to replace it within 2 days with no excess to pay.

    Additional information can be found in the Insurance Product Information Document (IPID)

    Very Protect - Replace insurance excludes some situations including not following the manufacturer’s instructions and wilful neglect. Further Relevant Information

    The full list of benefits and exclusions can be found in the policy Terms and Conditions.

    Please remember to check if your item is already covered by another insurance policy.

    Shop Direct Finance Company will receive a commission from the Insurer for arranging and administering your Insurance policy.

    If after reading the information above, this policy meets your demands and needs, you can select below. If not, select No Insurance.

Total £169.00
This item may be eligible for Click & Collect
  • Product Description
  • Technical Specification
  • Customer Reviews
  • Questions and Answers

MPN: 508900 EAN: 4044155251753

Item number QXYFG

The Sennheiser CX 400BT True Wireless Earphones offer a truly outstanding audio performance.

The new Sennheiser CX 400BT True Wireless rewrite the rulebook for true wireless audio by bringing high-end acoustic technology to an exciting new range of everyday earphones. With intuitive customisable controls and all-day comfort and battery life, they are the ideal, uncompromised choice for people that are passionate about great sound.

The CX 400BT True Wireless deliver astonishing performance thanks to Sennheiser’s acclaimed 7mm dynamic drivers. This bespoke acoustic system delivers high-fidelity stereo sound with deep bass, natural mids and clear, detailed treble. Whether bringing vocals to life or stepping up the intensity of the bass, the built-in equalizer and Sennheiser Smart Control app make it possible to shape the sound to feel every emotion. 

Touch controls make it effortless to stay entertained, stay informed and stay connected. The customizable interfaces on the earbuds provide full control of music playback, volume and calls as well as fast and intuitive access to voice assistants such as Siri and Google Assistant.

Support for codecs such as SBC, AAC and aptX also assures exceptional sound quality with both Apple and Android mobile devices. The earbuds also feature ambient noise reduction microphones to ensure that making phone calls and voice interaction with smart assistants is incredibly natural and crystal clear.

Device connectivity is refreshingly hassle-free due to Bluetooth 5.1 compatibility for reliable connectivity and easy management of Bluetooth connections using the Smart Control app. Even using the case is a smart experience, as the earbuds automatically power on when taken out and power down to save energy when replaced. With 7 hours’ battery life and up to 20 hours available when charging on-the-go with the case, the CX 400BT True Wireless keeps entertaining throughout the day.
  • Depth: 33.8 MM
  • Height: 42.3 MM
  • Width: 59 MM
  • Battery Life (in hrs): 20
  • Blue Tooth: Y
  • Dongle Required: N
  • Noise Cancellation: N
  • Power Output: 600W - 999W
  • Wifi Enabled: N
  • 7mm dynamic driver - Experience superior sound quality from audio specialist Sennheiser
  • Codec support – SBC, AAC and aptX: Wide range of Bluetooth audio codec support
  • Customizable touch controls – Let you define your personal interface for effortless control
  • Built-in equalizer - Personalizing your audio experience
  • Bluetooth connections management – Switch easily between your audio sources
  • 7 + 13 hours playtime – Listen to music for up to 20 hours thanks to the charging case
  • Ergonomics design – Revel in sound in its smallest, most comfy form
  • ·        Voice Assistant support - Interact at a touch with Google Assistant and Apple Siri

Technical Specification

Product DescriptionSennheiser CX 400BT - true wireless earphones with mic
Product TypeTrue wireless earphones - Bluetooth
Recommended UsePortable electronics
Headphones Form FactorIn-ear
Wireless TechnologyBluetooth
Headphones TechnologyDynamic
Bluetooth VersionBluetooth 5.1
Sound Output ModeStereo
Audio SpecificationsFrequency Response 5 - 21000 Hz
ControlsVolume control, answer/end, play/pause, next/previous track, reject call, pair mode, voice assistant, equaliser preset
Intelligent AssistantSiri, Google Assistant