In stock


  • 42mm Drivers
  • 3 Active Noise Cancellation Modes
  • Smart Pause Automatic Pause/Restart
  • Remotely Find if Misplaced with Tile
  • Up to 17 Hours of Playback with ANC
  • Built-In Microphone for Hands-Free Calls
  • Bluetooth 5.0 Compliant
  • Activate Digital Assistant from Earcup
  • Genuine Leather-Wrapped Earcups/Headband
  • Folding Design with Zippered Carry Case

QAR 399.00

In stock

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Product Description

Take control of your wireless audio experience with the CX 400BT True Wireless In-Ear Headphones from Sennheiser. Utilizing the Sennheiser Smart Control app for iOS and Android devices, you can fully customize the functionality of the CX 400BT’s integrated touch controls. Both earbuds feature touch controls and you can set what a single, double, or triple tap does, as well as what happens when you tap and hold the side of the earbud. Options include music management functions and engaging your phone’s digital assistant software.

Sennheiser engineered the CX 400BT headphones to ensure what you play through them sounds as good as possible. Featuring 7mm dynamic drivers and support for multiple codecs, including aptX. With dual integrated MEMS microphones, these true wireless headphones can be used for more than music. Pair them with a smartphone for hands-free wireless calls or give voice commands to your phone’s digital assistant. Music, calls, and more can be enjoyed for up to 7 hours on a full charge, with an extra 13 hours provided by the included charging case.

Customizable Controls

The flat surface on the outside of each earbud is a touch-sensitive control panel with 4 customizable controls on each side. They are activated by a single, double, or triple tap, as well as tapping and holding the earbud. Through the Sennheiser Smart Control app, you can set each of the 8 possible controls to a specific function. You can choose from voice assistant, play/pause, previous track, next track, volume up, volume down, power on/off, or tono function at all.

Custom EQ Presets

Within the Sennheiser, Smart Control app is the ability to customize EQ settings and create your own presets for different types of music.

Charging Case

A built-in 420mAh battery inside the charging case delivers up to 13 hours of power to the CX 400BT earbuds. Recharging begins immediately as soon as you place them inside the case. The case itself can be recharged with the included USB Type-C cable and (optional) adapter or mobile device with charging capabilities.

Quick Charge

In a rush and low on power? Place your earbuds inside the charging case for just 10 minutes to give them enough power to support up to 1 hour of playback.

Additional Features

Includes four pairs of silicone ear tips
App-based headphone setup
Firmware upgradable via the app
Support for Bluetooth 5.1

What’s in the box

  • CX 400BT True Wireless Earbuds
  • Silicone ear adapter sets (XS, S, M, L)
  • Charging Case
  • USB-C Cable
  • Quick Guide & Safety Guide

Headphone Design

Earbud, In Ear, True Wireless

Headphone Type


Earpiece Design In-Ear (Intra-Aural), Closed-Back
Driver Type Dynamic
Number of Drivers 1, per Earpiece
Driver Size 0.28″ / 7 mm
Impedance 470 Ohms (Active)
100 Ohms (Passive)
Active Noise Cancellation No
Controls/Microphone Location Controls: Left Earpiece, Right Earpiece
Microphone: Left Earpiece, Right Earpiece
Sensors Touch
Frequency Response 5 Hz to 21 kHz (Wireless)
Maximum Sound Pressure Level (SPL) 114 dB at 1 kHz
Total Harmonic Distortion (THD) 0.08%
Number of Mics 2
Beamforming Support Yes
Frequency Response 100 Hz to 10 kHz
Wireless Modulation Bluetooth: π/4 DQPSK, 8DPSK, GFSK
Supported Audio Codecs AAC, SBC, aptX
Bluetooth 5.1
Frequency Bluetooth: 2.4 GHz (2.402 to 2.48 MHz)
Transmitter Power 10 mW
Battery Chemistry Lithium-Ion
Runtime 7 Hours (BT)
Capacity (mAh) 55 mAh (Left Earpiece)
55 mAh (Right Earpiece)
Quick Charging Times 10 Minutes for 1 Hour
Recharge Time 1.5 Hours
DC Input Power 5 VDC at 650 mA
Charging Port Pins
Additional Runtime 13 Hours
Battery Chemistry Lithium-Ion
Capacity 420 mAh
Charging Interface USB Type-C
Dimensions Headphones:
26.6 x 23.3 x 22.2 mm (Each)
Charging Case:
59 x 42.3 x 33.8 mm
Weight Headphones:
6 g (Each)
Charging Case:
37 g