These noise isolating full range stereo headphones are compatible with many stereo audio devices including iPhone, iPod, and other MP3 players. They also feature a built in mic, and large drivers for strong bass response. Specifications: Frequency range: 20hz - 20khz, Impedance: 32 ohms, Sensitivity: 107db/mw, Max input power: 50mw, Cord Length: 1.2m, Plug type: 3.5 mm stereo.