A-szcxtop(TM) USB Virtual 7.1 Channel External Sound Card Audio Adapter USB 2.0 Full-Speed (12Mbps) Specification. USB bus-powered, no external power required. 2 LED indicators: Microphone-Mute Status, Activity. Connectors: USB Type A, Stereo output jack, mono microphone input jack. No driver required for Windows 98SE/ME/2000/XP/Server 2003/Vista,Linux,MacOS.