Computer Accessory Sets features: Coaxial RCA Input to Optical Toslink Output Digital Audio Converter Adapter(Black) Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. 1. Digital Audio Signal Converter device converts Coaxial RCA Plug (IN) to Optical TosLink Plug (OUT). This converter will transform a digital RCA Coaxial (S/PDIF) audio signal to a Digital Toslink Optical signal. This coaxial to optical converter will allow you convert the coaxial digital audio output from your DVD, cable or satellite receiver to a Toslink digital optical input. 2. Support all S/PDIF digital audio transmission for uncompressed PCM, LPCM,Dolby AC-3, Dolby 5.1 and DTS sound. 3. Easy to install and simple to operate. 4. Please Note: this product will not convert ANALOG AUDIO (typically left & right -Red and White RCA audio to the Digital Audio Formats).