Kensington USB Hi-Fi Headphones with Microphone - About this item - High-quality stereo sound - powerful 40mm drivers with Deep bass and a wide dynamic range deliver an exceptional listening experience, Best-in-class comfort - the headphones' padded headband is designed to fit heads of all ages and the foam ear pads provide hours of comfortable use, 6 foot USB cord - built to be strong enough for heavy use, Noise-cancelling microphone - the microphone uses passive resistance technology to filter out ambient noise, Safe listening limit - the maximum output is set to 94Db to prevent hearing loss