The black Optical to S/PDIF Coaxial Digital Audio Converter from C2G connects the TOSLINK optical output from your DVD player, cable, or satellite receiver to a S/PDIF coaxial digital audio input. It can be used to change the media format for older receivers, DVD players, and other devices to get full-digital signal and sound quality, thereby eliminating the need to purchase a new receiver. The easy-to-install unit converts a TOSLINK digital input to a S/PDIF coaxial digital output and is well suited for home theater, Dolby Digital, and DTS sound systems. It also includes a power supply.