Compucessory - CCS15154 Lightweight stereo headphones feature a microphone for easy, clear communication with your associates. The 3.5 mm input fits a variety of devices. Design also features a 27mm driver unit, 20Hz-20kHz frequency response, 32 OHM impedance, 89 +/- 4dB sensitivity, and 30MW maximum input. 71" cord allows a long reach so you can move more freely and relax away from your source device.