Etekcity Analog to Digital Audio Converter, Analog Audio Input to Digital Optical or coaxial Output, Black Convert RCA L/R Audio to Optical S/PDIF Toslink & Digital Coaxial , great for Stereo, TV, Sound System, Receiver, DVD Player, Soundbar, etc Electromagnetic noise-free transmission Uncompressed 2-channel LPCM digital audio output Simultaneous optical and coaxial output Easy to install and simple to operate