The USB Virtual 7.1 Channel Sound Adapter is a highly flexible audio interface which can be used either with Desktop or Notebook/Laptop systems; it turns your stereo speaker or earphones into 7.1 channel environment, giving you high quality sound enjoyment. Features Plug and play, automatic installation USB bus-power, no external power supply needed Dual Stereo audio out and mono microphone sockets With microphone-mute, speaker-mute, volume up and down four function keys Xear 3D driven for verious 3D soud simulation Turn your stereo speaker or earphones into 7.1 channel environment Two jacks, the green one is for stereo output, and the yellow one is for mono microphone input