Features: Supports AES/EBU, IEC60958, S/PDIF Truly supports 5.1 and 7.1 channels. Connect to 5.1 speakers for immersive sound. Up to 48KHz sampling rate, supports 32KHz/44KHz/48KHz digital recording. The sound card's fiber output only supports a 48KHz sampling rate, so DTS-CD is 44KH 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. Compliant with audio device specification V1.0. Supports USB full speed transfer 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 theaters and users with high sound quality requirements (like watching movies/playing games/karaoke). Can be connected to regular headphones for voice chat and online karaoke. Other: Enjoy genuine 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