Product details of Mini USB 2.0 3D Virtual 480Mbps External 7.1 Channel Audio Sound Card Adapter - Black.100% New.2.LED indicators: Microphone-Mute Status, Activity3.USB2.0 Full-Speed ( 12Mbps ) Specification4.USB Class Specification 1.15.USB Audio Device Class Specification 1.0. USB bus-powered, no external power required.6.The USB 2.0 External 7.1-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.