Sennheiser CX 400BT True Wireless

General Information

Superior sound, tailored to you
CX 400BT True Wireless earphones


Rules are there to be broken: With the new CX 400BT True Wireless, Sennheiser has rewritten the rulebook for true wireless audio by bringing its high-end acoustic technology to an exciting new pair of everyday earphones. With intuitive customizable controls, all-day comfort and a 7-hour battery life that can be extended to up to 20 hours using the supplied charging case, they are the ideal, uncompromised choice for anyone with a passion for great sound.

The CX 400BT True Wireless will be available in black and white from September 15, 2020.
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Technical Data
Speaker typeSennheiser 7mm dynamic driver
Ear couplingIn-ear, closed acoustics
Frequency response5 - 21,000 Hz
Frequency response (Microphone)100 Hz to 10 kHz
THD, total harmonic distortion<0,08% (1kHz / 94dB)
Bluetooth VersionBluetooth 5.1 compliant
CodecsSBC, AAC, aptX™
Supported ProfilesA2DP, AVRCP, HSP, HFP
App supportSennheiser Smart Control App for iOS™ and Android™
Power supply5 V⎓ 650 mA max
Battery SpecificationBuilt-in Lithium-Ion rechargeable batteries
Battery timeUp to 7 hrs music playtime with earbuds Up to 20 hrs music playtime with charging case
Charging time1.5 h for full charge / 10 min for 1 h playtime
USB StandardUSB-C
Weight49g (both earbuds and charging case)
6g (single earbud), 37g (charging case)
Dimensions59 x 33.8 x 42.3 mm (earbuds and charging case)
Package dimensions(L x B x H) 170 x 115 x 47 mm
Warranty2 years


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