1.7.1 channel USB sound card 2.USB2.0 3.support both window and vista ... .factory price and quick delivery 7.1 channel USB external sound card USB 2.0 3D 7.1 Audio 8 Channel ... Sound Box USB Spec 2.0 full speed compliant USB Audio ... protection C-Media value added software(multi-channel positional 3D sound, AC-3 encoder, ect. ) Embedded USB transceiver and power and ...