beyerdynamic MMX 1 Digital Multimedia Headset (Discontinued by Manufacturer) Digital multimedia headset with integrated USB interface for PC gaming or music Uncompromising hi-fi quality sound Condenser microphone with super-efficient noise cancellation for crisp sound Supports USB-equipped Windows 98 SE, Me, 2000, XP, or Vista and Mac OS 9 or OS X computers 20 Hz to 18 kHz frequency response and 32-ohm impedance