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 passive noise cancellation, 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.


Better sound. Better control.

Whether you’re in the mood for calming tunes or crave some thrilling beats, the bespoke drivers of the new CX 400BT True Wireless deliver high-fidelity sound with deep bass, natural mids and a clear, detailed treble.  Plus, you can personalize your listening experience with built-in equalizers to enjoy amazing sound quality that’s tailored to you.


Premium sound. Any device.

No matter where you stand – iOS or Android – you’ll always get to enjoy the outstanding sound quality of the new CX 400BT True Wireless earbuds.  Thanks to our wide range of audio codec support including SBC, AAC and aptX, premium sound is guaranteed with any mobile device.


Anytime. All the time.

Never miss a beat throughout the day with 20 hours of battery life – 7 hours on a single charge and a further 13 hours with the small, sleek and compact charging case.  Sennheiser CX 400BT True Wireless earbuds are designed to ensure you get premium sound wherever you go.


Stylish comfort.

The new CX 400BT True Wireless is made for those who enjoy diving into a long playlist, a lively audiobook or a loving phone call.  Available in black and white, they have an ergonomic design created for all-day comfortable wearing.  The earbuds achieve a perfect fit in the ear for excellent passive noise cancellation and keep the earbuds securely in place, thanks to adapters provided in a choice of four sizes.


Smart Control App

  • Create your sound experience: customize what you hear and how you interact with your Sennheiser device
  • Enhance what you hear: adjust the intuitive equalizer to perfect your listening experience
  • Define your touch controls: control your music, voice assistants, and calls with adjustable touch controls your assign

Sennheiser CX 400BT True Wireless (ship to Hong Kong only)

    • Dimensions: 59 x 33.8 x 42.3 mm (earbuds and charging case)
    • Weight: 49g (both earbuds and charging case) 6g (single earbud) 37g (charging case)
    • Package dimensions: (L x B x H) 170 x 115 x 47 mm
    • THD, total harmonic distortion: <0,08% (1kHz / 94dB)
    • USB Standard: USB-C
    • Frequency response (Microphone): 100 Hz to 10 kHz
    • Bluetooth Version: Bluetooth 5.1 compliant
    • Supported Profiles: A2DP, AVRCP, HSP, HFP
    • Frequency response: 5 - 21,000 Hz
    • Ear coupling: In-ear, closed acoustics
    • Charging time: 1.5 h for full charge / 10 min for 1 h playtime
    • Power supply: 5 V⎓, 600 mA max USB charging via USB-C socket at charging case
    • Battery Specification: Built-in Lithium-Ion rechargeable batteries
    • Codecs: SBC, AAC, aptX™
    • Battery time: Up to 7 hrs music playtime with earbuds Up to 20 hrs music playtime with charging case
    • App support: Sennheiser Smart Control App for iOS™ and Android™
    • Speaker type: Sennheiser 7mm dynamic driver