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NZD$329.95 Incl. GST
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Superior sound. Tailored to you.

The new CX 400BT True Wireless rewrites the rules for true wireless audio. Powered by premium dynamic driver technology, Sennheiser’s new earphones offer an uncompromised listening experience for anyone passionate about sound. A built-in equalizer and customizable touch controls make them easy to personalize and effortless to use, while SBC, AAC, aptX and Bluetooth 5.1 support ensure flawless audio with mobile devices. For all day listening, the CX 400BT True Wireless has a 7 hours battery life with up to 20 hours available when charging on-the-go with the case, while the earbuds’ ergonomic design assures a secure fit in perfect comfort.

Superior Sound

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
Everyday Accessibility

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

Techincal Data

Wearing style: True wireless stereo earphones

Ear coupling: Ear Canal

Connectivity: Bluetooth 5.1 compliant, class 1, 10mW (max)

Supported profiles: A2DP, AVRCP, HSP, HFP

Supported codecs: SBC, AAC, aptX™

Speaker principle: Dynamic

Speaker size: 7mm diameter

Speaker frequency range: 5 Hz to 21 kHz

Speaker sensitivity: 107 dB SPL (1 kHz / 1 mW)

Speaker THD: <0,08% (1kHz / 94dB)

Active Noise Cancellation: No, only passive noise reduction

Mic principle: MEMS

Mic frequency range: 100 Hz to 10 kHz

Mic pick-up pattern: 2 mic beamforming for ambient noise reduction

Battery lifespan: Up to 7 hrs music playtime with earbuds
Up to 20 hrs overall music playtime with charging case
(test condition: iPhone, mid volume level)

Charging time: Approx. 1.5 hrs for fully charged
After 10min charging 1 hrs music playtime
After 60min charging 5 hrs music playtime

Battery type: Built-in Lithium-Ion rechargeable batteries Left/right earbud: 55 mAh, charging case: 420 mAh

Product weight: 49 g (both earbuds and charging case), 6 g (single earbuds), 37 g (charging case)

Power supply: 5 V, 650 mA max USB charging via USB-C socket at charging case

Product dimension: 59 x 33.8 x 42.3 mm (earbuds and charging case)

App support: Sennheiser Smart Control app for iOS™ and Android™