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Sennheiser Black MM 400-X On-Ear Foldable Bluetooth Phone Headset

  • Android, iPhone/iPod/iPad compatible
  • New iPad and tablet compatible for streaming music
  • Discrete, invisible microphone is always out of the way
  • DuoFol transducer for exceptional clarity and rest-re
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Learn more about the Sennheiser Electronic corp. MM 400-X


Wireless & Bluetooth
MM 400-X


Wireless Type
Operating Time
Talk Time: Up to 20 hours

Listening Time: Up to 10 hours
Up to 33 feet

General SPEC

Frequency Response
<0.1% (1 kHz)
Power Supply
Replaceable battery
Up to 107 dB SPL
Ear Coupling
3.7 oz. (105 g)

Microphone SPEC

Microphone Frequency Response


New iPad and tablet compatible for streaming music!

Wireless freedom with Stereo A2DP Bluetooth -- hands-free convenience and hi-fi stereo sound on Apt-X capable audio sources

Discrete, invisible microphone is always out of the way

Direct cable option - listen as a wired headphone when Bluetooth is not permitted

Android, iPhone/iPod/iPad compatible, compatible with all 1/8" (3.5mm) headphone plugs

Easy-to-use controls are within optimum reach and provide concise "click" feedback

World-famous Sennheiser acoustics from exclusive DuoFol transducer system

Plush ear cushions seal out ambient noise while maintaining luxurious comfort for hours on-end.

Collapsible headset stores in a compact footprint for convenient portability

Replaceable battery charges via USB port or supplied wall adapter

Connect everywhere - to mobiles, laptops, MP3 players, or in-flight entertainment systems with an all-in-one headset solution

*Due to the nature of Bluetooth technology, users may experience a slight audio latency when watching video on a portable device. The headphones are working fine. This is a characteristic of all Bluetooth headsets. Latency is not an issue for audio-only use, OR when using the included detachable headphone cable for a wired audio connection when watching video.

Quick Info


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years

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