Check the listing for details. 3PCS USB 2.0 External 7.1 Channel 3D Virtual Audio Sound/Mic Adapter Laptop PC. Condition: New. Listed at 9.99 USD. Included: 3 x USB 2.0 3D Virtual 7.1 Channel Audio Sound Card AdapterDescription:The USB Virtual 7.1 Channel Sound Adapter is a highly flexible audio interface which can be used either with Desktop or Notebook systems, It turns your stereo speaker or earphones into 7.1 channel environment. No drivers required,just plug and play for instant audio playback,also compatible with all major operaiton systems. Features: 100% Brand New. Size: 57 x 25 x 12mm LED indicators: Microphone-Mute Status, Activity USB2.0 Full-Speed ( 12Mbps ) Specification USB HID Class Specification 1.1 USB Audio Device Class 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-DownPlug and Play. No drivers required for Windows 2000 / XP / Server 2003 / Vista, Linux, Mac OS Compact, portable, convenient to carry