Proster Analog to Digital Converter 48kHz Compatible Converts Analog to Digital Includes Optical Digital Cable 【Product Description】 Converts R/L RCA analog signals or 3.5mm AUX audio signals simultaneously to digital coaxial and optical digital audio signals and outputs them. (Note: This is not a converter to convert digital to analog.) Supports a 48 kHz output sampling rate. Does not support Dolby, so please set the audio output to PCM or LPCM when using. 【Condition Description】 I was using it with a 3.5mm audio input and digital coaxial connection until recently. I will include the optical cable and USB power cable. (Optical cable operation not confirmed as I don't have the equipment to test it.) Since it converts to digital format once, you can connect audio cables without being affected by noise. It is also ideal for connecting to devices that only support digital input.