XITEL  Pro HiFi-Link Play DVDs with Dolby Digital or DTS Digital Surround sound Play MP3s, WMA, WAV, Real, Liquid & all other formats Cuts out distortion & interference USB connection for easy installation Includes everything you need - PowerDVD software, 30 feet of optical digital cable, 30 feet of coaxial digital cable, & 30 feet of fully shielded studio-grade RCA cable.