Features Supports AES/EBU, IEC60958, S/PDIF Supports 5.1 and 7.1 channels. Connectable to 5.1 speakers. Up to 48kHz sampling rate, supports 32kHz, 44.1kHz, and 48kHz digital recording. The sound card's optical output supports a 48kHz sampling rate; DTS-CD at 44.1kHz requires sample rate conversion for playback. Compatible with Windows 98/ME/2000/XP/Vista/Win7/Win8 and Mac OS 9.1 (2-channel audio only on Mac systems) Full-duplex audio playback and recording without requiring a built-in PC sound card. USB 2.0 interface, backward compatible with USB 1.1 Complies with Audio Device Class Specification v1.0 Supports USB full-speed data transfer up to 12 Mbps 3 input terminals, including one optical input 3 output terminals, including one optical S/PDIF output Output: 5.1 channels plus optical S/PDIF System setup: PC + sound card + amplifier + 5.1 speakers Ideal for HTPC home theater systems and users with high audio quality requirements, such as movie watching, gaming, and karaoke. Can be connected to standard headphones for voice chat and online singing applications. Experience authentic AC-3 or DTS surround sound in your digital home theater, or connect directly to a 5.1 active speaker system. Package Includes 1 x Sound Card