Koss The Plug is a stereo earbud for the discriminating listener. It delivers accurate acoustical reproduction and unbelievable isolation typically found in more expensive, closed-style stereophones. The Plug features a dynamic element that is positioned just outside the ear and connected to a tubular port structure that is inserted on a soft expandable cushion into the ear canal. The soft foam cushion expands for a custom fit to improve isolation and enhance deep bass and treble clarity.
The Plug has special ear cushions made of hydrophilic, formed urethane, for a custom fit each and every time it is inserted into
