Power Acoustik HP-11S 1-Channel Wireless IR Headphones for Power Acoustik Mobile A/V SystemsFor use with Power Acoustik(R) Mobile A/V systemsSingle-channel IR wireless headphones with swiveling, fold-flat earpads for seat pocket storageAdjustable straps for maximum comfortOn/off switch saves battery lifeAuto off and auto muteVariable volume controlAuto level controlMP3 player input via 3.5 mm inputRequires 2 AAA batteriesIncludes EVA hard carrying case1 pair1-Channel Wireless IR Headphones for Power Acoustik(R) Mobile A/V Systems