2pcs 7.1 External USB Sound Card USB to Jack 3.5mm Headphone Audio Adapter Micphone Sound Card For Mac Win Compter Android Linux Features: 100% Brand New. Size:About 57 x 25 x 12mm (1pcs) LED indicators: Microphone-Mute Status, Activity USB2.0 Full-Speed ( 12Mbps ) Specification USB HID Cla Specification 1.1 USB Audio Device Cla Specification 1.0. USB bus-powered, no external power required. This is USB 2.0 External 7.1-Channel Audio Sound Card Adapter. It can work with either desktop or laptop. it extends your stereo speaker or earphone to 7.1 channel environment, giving you high quality sound enjoyment. Connectors: USB Type A, Stereo output jack, mono microphone input jack Functions keys: Microphone-Mute, Speaker-Mute, Volume-Up and Volume-Down Plug and Play. No drivers required for Windows 2000 / XP / Server 2003 / Vista, Linux, Mac OS Compact, portable, convenient to carry Package including: 2 x 7.1 usb sound card