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Sennheiser CX 400BT In-Ear True Wireless Earbuds - Black363/3034

Rating 4.3 out of 5
Read reviews (10)
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Sennheiser CX 400BT  In-Ear True Wireless Earbuds - Black
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  • £169.00

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About this product

The CX 400BT True Wireless powered by premium dynamic driver technology, An uncompromised listening experience for anyone passionate about sound. A built-in equalizer and customisable touch controls make them easy to personalise and effortless to use, while SBC, AAC, aptX and Bluetooth 5.1 support ensure flawless audio with mobile devices. The CX 400BT True Wireless has a 6.5 hours battery life with up to 20 hours available when charging on-the-go with the case, while the earbuds' ergonomic design assures a secure fit in perfect comfort.

7mm dynamic driver - Experience superior sound quality from audio specialist Sennheiser.

Voice Assistant support - Interact at a touch with Google Assistant and Apple Siri.

Customisable touch controls – Let you define your personal interface for effortless control.

Headphone Features

  • Silicone ear pieces.
  • USB-C cord.
  • Detachable cable.
  • Connection: true wireless.
  • Bluetooth enabled for a wireless connection to your devices .
  • With a USB-C connection.
  • 7mm driver.
  • Passive noise cancellation.
  • 10m range.
  • Carry case.
  • Bass control.
  • Compatible with universal smartphones.
  • Batteries required 3 x Li-Ion battery (included) .
  • Rechargeable battery.
  • 90 minute charging time.
  • Charging case included.
  • In the box: CX 400BT True Wireless , Charging case, USB-C charging cable, Silicone ear adapter sets (in size XS/S/M/L).

General Information

  • Model number: CX 400TW.
  • Manufacturer's 2 year guarantee.
  • EAN: 4044155251753.

The small print

*Prices correct as displayed but are subject to change.


The customer and brand answers you’ll see above are submitted independently. As we don’t review these answers, we can’t take responsibility for anything they may say. The responses from Argos colleagues are accurate at the time of publishing. For the latest info, you should check the product page.


This product comes with a minimum one year manufacturer’s guarantee, unless otherwise stated in the specification above.