1. Support: AES/EBU, IEC60958, S/PDIF 2. Truly supports 5.1 channels and 7.1 channels. Can connect to 5.1 speakers 3. Up to 48KHz sampling rate, supporting 32KHz/44KHz/48KHz digital recording function 4. The sound card fiber output only supports a sampling rate of 48KHz, so DTS-CD is 44KH and requires conversion to listen 5. Support Win98/ME/2000/WIN7/WIN8/WIN 10/MAC OS9.1 (only 2 channels can be used in MAC) 6. Playback and recording of full duplex audio streams without the need for abuilt-in PCsound card 7. USB2.0 Backward compatibility USB 1.1 8. Compatible with audio device specification V1.0 9. Supports USB full speed transmission specifications up to 12Mbps 10. 3 input terminals (one of which is a fiber optic input) USB/SOUND/CARD 11. 3 output terminals and 1 fiber optic output terminal; 7.1 CH/OPTICAL