Digital Coaxial audio signals and Optical Toslink Digital audio signals are two variations of the same S/PDIF standard. The hassle comes when you have some equipment that uses Digital Coaxial and other equipment that uses Toslink. In this case you need to adapt one signal type to the other type. This adapter converts the optical Toslink input signal into an electrical Digital Coaxial output. It has a small footprint, less than 3" x 2", which makes it easy to hide behind your equipment rack. It is powered by an included 6 VDC, 3A AC adapter. *** 30-day easy returns. No restocking fee. Free lifetime technical support. 1 year warranty. ***