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The Sennheiser MM 400 are a pair of mid-range to high-end on-ear headphones somewhat similar to the Sennheiser MM 100.

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Pros

easy to answer calls as they come in, main button is located in a logical and accessible place for answering

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reasonable amount of isolation from external noise, block a fair bit out

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voice quality on both ends of the conversation is very clear

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volume adjustment and track skipping buttons are easy to work with and intuitive

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includes a nice travel pouch to keep everything safe and easy to transport

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comfortable enough to be worn for hours at a time without any soreness

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makes the most of Bluetooth bandwidth, creates a full and rich sound

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battery lasts for days at a time without needing a recharge

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pairs with Bluetooth devices right away, very simple process to accomplish

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Cons
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Edit

 

The Sennheiser MM 400 are a pair of mid-range to high-end on-ear headphones somewhat similar to the Sennheiser MM 100. The MM 400s sport a number of improvements over the MM 100s, namely: a greater frequency response (15 - 22,000 Hz as opposed to 22 - 20,000 Hz), a closed design, an in-flight adapter and a foldable design. Otherwise, the two pairs of headphones sport similar features, including stereo Bluetooth capability and an integrated microphone. The MM 400s' dynamic drivers provide well-balanced audio, ensuring rich bass tones and unwavering treble while their closed design ensures a mild level of passive noise isolation. Their Easy-2-GO design allows the MM 400s to be extremely portable as they can be folded up to save room while their metal-reinforced headband ensures that minimal damage will be incurred during travel. Meanwhile, the MM 400s' stereo Bluetooth wireless design allows them to be connected to up to two devices simultaneously.

Features
  • Bluetooth Version 2.0 + EDR capable / supported profiles: A2DP + AVRCP + HSP + HFP
  • Frequency response: 18 – 22,000 Hz
  • Integrated headset controls
  • Integrated microphone
  • In-flight adapter included
  • Easy-2-GO foldable design
  • Secure fit – soft cushions for excellent wearing comfort without pressing tightly against the ears
  • 2-year international warranty
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