Features Supports AES/EBU, IEC60958, S/PDIF Truly supports 5.1 channels and 7.1 channels. Can be connected to 5.1 speakers Up to 48 kHz sampling rate, supports 32 kHz/44 kHz/48 kHz digital recording function The fiber output of the sound card only supports a sampling rate of 48 kHz, so DTS-CD is 44 kHz and requires conversion to listen Supports Win98/ME/2000/XP/VISTA/WIN7/WIN8/MAC OS9.1 (only 2 channels can be used in MAC) Full-duplex audio stream playback and recording without the need for an onboard PC sound card USB 2.0 is backward compatible with USB 1.1; Compliant with Audio Device Specification V1.0; Supports USB full-speed transmission specifications up to 12 Mbps; 3 input terminals (one of which is an optical input) 3 output terminals and 1 optical output terminal; Output: 5.1 channels + fiber SPDIF Composition: PC + sound card + amplifier and 5.1 speakers Applicable to: HTPC home theaters and friends with high sound quality requirements (such as watching movies/games/karaoke), can be connected to ordinary headphones for voice chat and online karaoke. Others: Enjoy true AC-3 or DTS surround sound effects in your digital home theater or connect directly to a 5.1 active speaker. Package includes 1 * Sound Card