Sennheiser CX 400BT True Wireless In-Ear Headphones (White)

Model: 508901

SKU: 385521 Product ID: 275635

  • 7mm dynamic driver delivering superior sound quality
  • Up to 6.5 hours play back time with up to 20 hours available with on the go charging via the case
  • Customisable touch controls


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    Rules are there to be broken: With the new CX 400BT True Wireless, Sennheiser has rewritten 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. Developed for the audio specialist’s premium true wireless earphones, 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. 
    Intuitive and effortless to use
    The CX 400BT True Wireless has been created for today’s face-paced, always-on lifestyles. Touch controls make it effortless to stay entertained, stay informed and stay connected. The customisable 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. 
    Experience all day entertainment in total comfort 
    With 6.5 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 – and comes with all-day comfort to match: Stylish, minimalist, and perfectly balanced, the earbuds’ ergonomic design – available in either black or white – assures all-day wearing comfort. It’s easy to achieve a perfect fit in the ear for excellent passive noise cancellation and to keep the earbuds securely in place, thanks to adapters provided in a choice of four sizes. Meanwhile, Sennheiser’s exacting build quality ensures lasting take-anywhere durability.  

    Key Features

    7mm dynamic driver delivering superior sound quality

    Customisable touch controls

    Up to 6.5 hours play back time with up to 20 hours available with on the go charging via the case

    Voice Assistant support

    Built-in equalizer

    Ergonomic design made for all day wearing


    Headphones type - In-ear wireless

    True Wireless earbuds - Yes

    Colour - White

    Headphones use - Street/fashion

    Virtual Assistant Built-in - Google Assistant

    Built-in microphone - True

    Manufacturer's warranty - 2 Years

^Discounts apply to most recent previous ticketed/advertised price. As we negotiate on price, products are likely to have sold below ticketed/advertised price in stores prior to the discount offer.