Beyerdynamic MMX-2 USB - dynamic headset system (closed), on-ear, 18Hz-22kHz, 110dB nominal SPL, 32 Ohms impedance, condenser mic with cardioid polar pattern. Includes USB adapter. Cable length: 2.5m with 3.5mm stereo plug. Weight: 155g. Compatible with Windows 98 SE, ME, 2000, XP, Vista, Windows 7and 8 and Mac (OS9 and OSX).