SENNHEISER PC 363D 2 x 3.5mm Connector Circumaural Headset - Black Cord Length: 6.56 + 3.94 ft. Headphone Frequency Response: 15Hz-28KHz Weight: 9.9 oz. Microphone Impedance: ~2K ohm Microphone Frequency Response: 50Hz-16KHz Microphone Sensitivity: -38 dBV at 94 dBSPL