brand new and high quality The USB Virtual 7.1 Channel Sound Adapter is a portable sound controller that can add 3D sound to any PC equipped with a USB port. The device is small enough to fit comfortably in the for palm of the hand and light for easy transportation. It is also easy to use simply plug the device into a spare USB port and it provides high-quality via speakers or headphones. It produces a superior sound to its 5.1 predecessor. for USB 2.0 full-Speed Specification for USB Device Class Specification 1.0 for USB for HID Class specification1.1 Include Xear 3D,the virtual 7.1 channel sound simulation software for Windows XP/Vista 98se/ME/XP/2000/2003/Linux, for OS USB2.0 Full-Speed (12Mbps) Specification Connectors: USB Type A, Stereo output jack, mono microphone input jack USB bus-powered, no external power required LED indicators: Microphone-Mute Status, Activity Size:5.70*2.50*1.40cm/2.24"*0.98"*0.55" Quantity:1Pc