Sennheiser CX 400BT True Wireless Earbuds – Bluetooth in-Ear Headphones, 7mm Drivers

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  • 7mm dynamic drivers and built-in equalizer
  • Fully adaptable controls for music, calls and voice assistant
  • SBC, AAC and aptX: Wide range of Bluetooth audio codec support
  • Up to 6.5 hours playback time + 13.5 hours charging via the case
  • Optimal comfort and secure fit with 4 ear adapter sizes
  • Enjoy speech optimized calls and voice assistance

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. This new model expands Sennheiser’s True Wireless earbud portfolio into a new price bracket. Offering the same sound signature as Sennheiser’s flagship earbuds, the MOMENTUM True Wireless 2, the new CX 400BT offers customizable controls, long-lasting battery life and an all-day comfort design, making it the perfect choice for everyday earbuds.

From the manufacturer

CX 400BT True Wireless MOMENTUM True Wireless 2
Color variants Black & White Black & White
Battery life 7h + 13h (earbud + charging case) 7h + 21h (earbud + charging case)
Customizable controls Yes Yes
Call function Yes Yes
Active Noise Cancellation Yes
Voice assistant access Yes Yes
Internal EQ / Custom presets Yes Yes
Transparent hearing Yes
Smart pause Yes
Splash Resistant (IPX4) Yes


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
    • Warranty
      2 years
    • Frequency response (Microphone)
      100 Hz to 10 kHz
    • Bluetooth Version
      Bluetooth 5.1 compliant
    • Supported Profiles
    • 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


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