Koss SportaPro Stereo Headphones Headband pivots backward at its base, easily converting from over-the-head style to a behind-the-head style.Connectivity Technology: Wired Foam ear cushions Collapses into a compact, protective package that tucks neatly in a briefcase, gym bag or backpack Frequency response: 5Hz-25kHz Imp: 60 15 to 25,000 Hz frequency response Flexible headband design, fully collapsible Foam ear cushions for open sound Includes 0.125-inch and 0.25-inch stereo plugs