Single dynamic driver in-ear by Korean micro-speaker company called Dynamic Motion.
Otto Isolating Ear Buds, Silver Your ears get bored. They want to be entertained. Not by voices of people around you they want music served up crisp,clear and without distortion. The kind of stuff MP3 players were made for, if only their headphonescould deliver. No problem, one easy upgrade and youve got the sound your ears are raving along with the customized comfort theyve been longing...