Allytech External USB 2.0 Virtual 8.1 Channel CH 3D Audio Sound Card Adapter Converter External USB 2.0 Virtual 8.1 Channel CH 3D Audio Sound Card Adapter Converter Can work with either desktop or laptop, it extends your stereo speaker or earphone to 8.1 channel environment, giving you high quality sound enjoyment. USB 2.0 full-speed, easy to use, plug and play, instead of the traditional sound card. Multi-function keys, support microphone-mute, speaker-mute, volume-up, volume-down, former-song, next-song and stop/ start. Supports for Windows 98SE/ ME/ 2000/ XP / Vista/ WIN7/ Win8/ Server/ MacOS 10 or higher.