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Sennheiser MM 400-X Bluetooth Headphones (With APTX)
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Sennheiser MM 400-X Bluetooth Headphones (With APTX)

State-of-the-art Stereo Bluetooth® headset

£124.17 Exc. VAT |  


Sennheiser MM 400-X Bluetooth Headphones (With APTX)

The MM 400-x is a state-of-the-art Stereo Bluetooth® headset for multimedia mobile phones. With one press of a button, you can quickly switch between calls and music delivered in superb stereo sound.

The invisible high-performance microphone ensures that conversations are clear, making this headset the perfect all-in-one sound solution. As an added benefit the MM 400-X enhances the latest apt-X® enabled mobile phones and computers with supreme CD quality sound.


  • CD quality audio –Featuring the apt-X® codec, the headsets can connect wirelessly to any Bluetooth® apt-X® enabled devices, such as the new Apple computers and selected Creative and Samsung music products
  • Wireless freedom – Bluetooth® 2.1 guarantees hands-free convenience without wires and the advanced A2DP profile for Stereo Bluetooth® delivers optimized hi-fi stereo sound
  • Invisible microphone – with high-performance sound quality for clear conversations
  • Direct cable option – for use on airplanes, with an airline adapter included
  • Easy headset controls – in one intuitive cluster
  • Sennheiser sound quality – hi-fi headphone drivers ensure superior dynamic range,
  • detail and excellent bass
  • Wearing comfort – padded ear-cushions provide an excellent soft fit, even on long trips
  • Easy-2-GO – the headset folds into a compact bundle for travel and storage, while the headband is metal-reinforced for durability
  • Flexible – replace the battery with a spare on long trips – or recharge it via the USB port on your laptop or the supplied lightweight wall charger with different plug fittings for Europe, the USA, the UK and Australia
  • Connect everywhere – to mobiles, laptops, MP3 players, or in-flight entertainment systems with an all-in-one headset solution
  • Peace of mind – thanks to the 2-year international warranty

Delivery Includes:

  • MM 400-X Bluetooth® headset
  • USB wall charger for US, EU, UK and AU
  • USB charging cable
  • In-flight adapters (3.5mm double mono jack)
  • Audio cable
  • Carry case
  • Quick set-up guide
  • User manual



Wearing style Supra-Aural
Technology Bluetooth® 2.1 + EDR / Supported profiles: A2DP + AVRCP + HSP + HFP / Codec: SBC, apt-X®
Talk time 20 h
Listening time 10 h
Charging time 3 h
Range 10 m
Weight 105 g
Frequency response 15–22000 Hz
THD, total harmonic distortion Less than 0.1% at 1kHz
Sound pressure level (SPL) 107 dB (1kHz, 1mW)
Microphone 100–10000 Hz
Pick-up pattern Omni-directional

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