Part Number: SD-AUD20101 Specifically designed to deliver a rich immersive listening experience for audio enthusiasts. Supporting stereo 24-bit resolution and up to 192 kHz sample rate, the USB Audio dongle features 2 stereo DACs which can achieve high performance 95 db Signal-to-Noise Ratio (SNR) and 2 stereo ADCs which can achieve high performance 90 db SNR Mac OS X does NOT have 7.1 driver and S/PDIF software. USB 2.0 Full-speed (12Mbps), USB Audio Device CompliantUSB Bus Powered. External Power Not RequiredVIA Envy VT1620A Audio ControllerConnectors:USB Type-AStereo Audio Output Jack (Optical S/PDIF Capable)Mono Microphone Input JackLED Indicators:USB ActivityMicrophone MuteControl Buttons:Microphone MuteAudio Output MuteVolume UpVolume DownPlug and PlayRoHS Compliant