... 25 x 12mm 4. OEM VIRTUAL USB 2.0 to 3D Audio Adapter Plug and Play 7.1 Channel ... 3D Sound simulation software, It turns your stereo speaker or earphones into 7.1 channel environment.OS ... ) Specification USB HID Class Specification 1.1 USB Audio Device Class Specification 1.0 USB bus-powered, ... XP / Vista is included Functions keys: Microphone-Mute, Speaker-Mute, Volume-Up and Volume-Down LED indicators: ...