The generated text mentions "DAC," which stands for Digital to Digital Converter. I purchased this new about six months ago, but I'm selling it because I've changed my audio setup. It connects via USB and converts to optical digital or coaxial digital. It supports high-resolution audio. By connecting it to your DAC via optical digital, you can create an audio environment that completely eliminates USB noise. The FX-D03J, a high-performance DAC with optical and coaxial inputs. - Model Name: FX-D03J - Connection Type: Optical/Coaxial - USB Input: Yes Thank you for looking.