Features Supports AES/EBU, IEC60958, S/PDIF Supports 5.1 and 7.1 channels; compatible with 5.1 speakers Up to 48kHz sampling rate; supports 32kHz, 44.1kHz, and 48kHz digital recording Optical output supports up to 48kHz sampling rate; DTS-CD at 44.1kHz requires sample rate conversion Compatible with Windows 98/ME/2000/XP/Vista/Win7/Win8 and Mac OS 9.1 (2-channel audio only on Mac) Full-duplex audio playback and recording; operates independently of built-in PC sound card USB 2.0 interface, backward compatible with USB 1.1 Complies with USB Audio Device Class Specification v1.0 Supports USB full-speed data transfer up to 12Mbps 3 input terminals, including one optical input 3 output terminals, including one optical S/PDIF output Output supports 5.1 channels plus optical S/PDIF Ideal for HTPC home theater systems and users requiring high-quality audio performance for movies, gaming, and karaoke Can be connected to standard headphones for voice chat and online singing applications Enjoy AC-3 or DTS surround sound in your digital home theater setup or connect directly to active 5.1 speaker systems Package Includes 1 x Sound Card