8.1 USB Stereo Audio Adapter External Channel Sound Card for Windows XP/2000/Vista/7 3D USB Audio Adapter for PC and Laptop Specifications 1.100% New. 2.LED indicators: Microphone-Mute Status, Activity 3.USB2.0 Full-Speed ( 12Mbps ) Specification 4.USB Cla Specification 1.1 5.USB Audio Device Cla Specification 1.0. USB bus-powered, no external power required. 6.The USB 2.0 External 8.1-Channel Audio Sound Card Adapter. It can work with either desktop or laptop. And with the Xear 3D Sound Simulation 7.software, it extends stereo speaker or earphone to 7.1 channel environment, giving high quality sound enjoyment. 8.Connectors: USB Type A, Stereo output jack, mono microphone input jack 9.Xear 3D virtual 8.1 channel sound simulation software for Windows XP / Vista is included 10.Functions keys: Microphone-Mute, Speaker-Mute, Volume-Up and Volume-Down 11.System:Windows 2000 / XP / Server 2003 / Vista, Linux, Mac OS Package including: 1 x usb sound card