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 set of 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 jack (for output) or the microphone jack (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 systems. * 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 HID Class Specification 1.1 USB Audio Device Class Specification 1.0