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Sennheiser CX 400 BT True Wireless Earbuds

• 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


  • 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. The new CX 400BT True Wireless earbuds are designed to ensure you get premium sound wherever you go.

    Minimalist Design.
    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.
  • Technical Data
    - 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
    - Warranty 2 years
    - 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⎓ 650 mA max
    - 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

  • What's in the box?
    CX 400BT True Wireless Earbuds x 1
    Silicone ear adapter sets (XS, S, M, L) x 1
    Charging Case x 1
    USB-C Cable  x 1
    Quick Guide & Safety Guide x 1