"Exceptionally Comfortable And Sound Great"
The Sennheiser MM 400 is a state-of-the-art stereo Bluetooth headphone that excels with multimedia-capable cell phones. Using a closed, on-the-ear design to block ambient noise, the MM 400 is an ideal companion for the urban commute or frequent traveler.
Advanced DuoFol transducers provide the kind of detail and frequency response you would expect out of hi-fidelity audiophile speakers. The easy-to-use control panel is intuitive and simple enough to operate with your eyes closed – a common way of enjoying Sennheiser's world-famous sound quality. Plush ear cushions help seal out ambient noise while maintaining luxurious comfort for hours on-end.
"Sound Quality is Crystal Clear"
"They are exceptionally comfortable and sound great," notes Dan Cohen in his November 29, 2009 review for GearDiary.com. "The ability to use them as a Bluetooth headset for your cell phone is a nice addition, the ability to turn them into a wired headset is not only smart but will come in handy when were on a plane tomorrow."
"The sound quality of the MM 400 is crystal clear with a good representation of audio across the spectra," reports Torbjorn Kamblad in his March 22, 2010 review for TouchGen.com. "If you are looking for a great wireless solution for music, definitely consider the MM 400."
Built-in Mic and Call Features
With the 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 for your digital lifestyle. The easy-to-use controls are within optimum reach and provide concise 'click' feedback.
Portability and Convenience
The MM 400 folds up for the ultimate in portability. The replaceable battery charges via USB or a wall adapter. For situations where Bluetooth is not permitted, you can use the included audio cable for a direct connection - making the MM 400 an extremely capable wired headphone as well.
The MM 400 is iPhone/iPod/iPad compatible and works with any device supporting 1/8" (3.5mm) headphone plugs. Connect everywhere – to mobiles, laptops, MP3 players, or in-flight entertainment systems with built-in adapter. The MM 400 is built-tough with a two-year manufacturer's international warranty from Sennheiser. | 
