StarTech.com Virtual 7.1 USB Stereo Audio Adapter External Sound Card Turn a USB port into a virtual 7.1 channel Sound Card Works with USB enabled laptop and desktop computers Supports 7.1 surround sound Built-in volume and mute controls and virtual 7.1 audio output for Windows Built-in volume control buttons USB 2.0 compliant host interface and USB Audio Device Class specification 1.0 No drivers required for Windows XP/2000/Vista/7