Features: Supports AES/EBU, IEC60958, S/PDIF. Truly supports 5.1-channel and 7.1-channel. Can be connected to 5.1 speakers. Up to 48KHz sampling rate, supports 32KHz/44KHz/48KHz digital recording function. The sound card's optical output only supports a 48KHz sampling rate, so DTS-CD at 44KH requires conversion for listening. Supports Win98/ME/2000/XP/VISTA/WIN7/WIN8/MAC OS9.1 (only 2 channels usable in MAC). Full duplex audio stream playback and recording without needing a built-in 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 12Mbps; 3 input terminals (one is an optical input), 3 output terminals, and 1 optical output terminal; Output: 5.1 channel + optical SPDIF. Configuration: PC + sound card + amplifier + 5.1 speakers. Suitable for: HTPC home theater and friends with high audio quality demands (like watching movies/gaming/karaoke). Can connect to regular headphones for voice chat and online karaoke. Other: 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