feature Supports AES/EBU, IEC60958, S/PDIF Truly supports 5.1 channels and 7.1 channels. Can connect to 5.1 speakers Up to 48KHz sampling rate, supporting 32KHz/44KHz/48KHz digital recording function The sound card fiber output only supports a sampling rate of 48KHz, so DTS-CD is 44KH and requires conversion to listen Support Win98/ME/2000/XP/VISTA/WIN7/WIN8/MAC OS9.1 (only 2 channels can be used in MAC) Playback and recording of full duplex audio streams without the need for a built-in PC sound card USB 2.0 is backward compatible with USB 1.1; Compatible with audio device specification V1.0; Supports USB full speed transmission specifications up to 12Mbps; 3 input terminals (one of which is a fiber optic input) 3 output terminals and 1 fiber optic output terminal; Output: 5.1 channels+fiber SPDIF Composition: PC+sound card+amplifier and 5.1 speaker Applicable to: HTPC home theaters and friends with high audio quality requirements (such as watching movies/games/karaoke), can be plugged into regular earphones for voice chat and online karaoke. Other: Enjoy real AC-3 or DTS surround sound effects in your digital home theater or connect directly to a 5.1 active speaker. Packaging includes 1 * Sound cardUSB Sound Card 7.1 5.1 Channel External Audio Card SPDIF Optical for PC Compute SZRH A-C