Based on Cmedia CM6206 7.1 channel USB audio controller. USB bus-powered (DC5.0v / 500mA). No external power dapter needed. 8 Channel analog outputs with 16-bit resolution. 2 Channel analog input with 16-bit resolution. Mono microphone input with 16-bit resolution. Microphone Boost On/Off button. LED indicators: Microphone Boost, USB status. Supports 48/44.1 KHz sampling rate for both playback and recording. Compiles with IEC60958 specification (Consumer format S/PDIF input and output). SCMS ( Serial Copy Management System) compliant. Dolby digital audio streaming via S/PDIF output