Plug the Sound Adapter into your USB port, and then plug your headphones into the Adapter. 7.1 Channel sound without the investment in a whole speakers! Tired of trying to stretch your cables around the back of your computer? Plug this Adapter into a USB port on the front, and use the headphone (for output) or the miniphone (for input). The USB Virtual 7.1 Channel Sound Adapter is a highly flexible audio interface which can be used either with desktop or notebook . Comes bundled with Xear 3D Sound simulation software, and turns your stereo speaker or earphones into a 7.1 channel environment! USB2.0 Full-Speed (12Mbps) Specification USB Class Specification 1.1 USB Audio Device Class Specification 1.0 USB bus-powered, no external power required. Technical Specification 100% New 7.1 Channel External USB Audio Sound Card Adapter USB2.0 Full-Speed Specification : USB Type A, Stereo output , mono miniphone input USB bus-powered, no external power required LED indicators: miniphone-Mute Status, Activity No drivers required for Windows 98SE / / 2000 / XP / 7 / Server 2003 / Vista, Linux, MacOS Dimensions: 2.25" x 1.0" x 0.50" Package include:1X External Sound Card Audio Adapter Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.