Optimal Shop Coaxial RCA Audio Signal To Optical SPDIF Toslink Digital Audio Signal Converter Adapter Box & DC 9V 600mA Charger 1.You can Plug your Digital Audio Coax in and get Toslink Digital Optical Out. 2.This transforms a digital RCA Coaxial (S/PDIF) audio signal to a Digital Toslink Optical signal. 3.This coaxial to optical converter will allow you to connect the coaxial digital audio output from your DVD, cable or satellite receiver to a Toslink digital optical input.