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 48KHz sampling rate, supports 32KHz/44KHz/48KHz digital recording function. The sound card's fiber output only supports a sampling rate of 48KHz, so DTS-CD is 44KHz 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 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 speakers. Suitable for: HTPC home theater and friends with high demands on sound quality (such as watching movies/games/karaoke), can be connected 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