100% brand new and high quality. 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. Connectors: USB type A, stereo output jack, mono microphone input jack. Xear 3D virtual 8.1 channel sound simulation software for Windows XP/ Vista is included. 8.1channel technology is much more better than 7.1 channel technology. 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.