Compliant with usb 2.0 full-speed ( 480mbps ) specification 2) complain with usb class specification 1.0 3) compliant with usb hid class specification 1.1 4) usb bus-power mode, no external power required 5) connectors: usb type-a, stereo output jack, mono microphone-input jack 6) functional keys: microphone-mute, speaker-mute, volume-up, volume-down 7) led indicators: microphone-mute status, activity 8) include xear 3d, the virtual 7.1 channel sound simulation xp/vista 9) driverless-no driver required for windows 98se/me/2000/xp/server 2003/vista, linux, mac os 7 8.