For use with Power Acoustik(R) Mobile A/V systems; Single-channel IR wireless headphones with swiveling, fold-flat earpads for seat pocket storage; Adjustable straps for maximum comfort; On/off switch saves battery life; Auto off and auto mute; Variable volume control; Auto level control; MP3 player input via 3.5 mm input; Requires 2 AAA batteries; Includes EVA hard carrying case; 1 pair;