Thank you for viewing. I was using this for listening to music on my desktop. I am selling it because I am replacing it. In preparation for the sale, I have confirmed audio input via USB and optical connections, and output to the headphone out and RCA out. Red light is also emitted from the optical output. It was working on Windows 10, 11, and Ubuntu. The exterior has no major scratches and is in relatively good condition, but there may be some minor scuffs or streaks. This product includes only the main unit and the USB cable, as shown in the images. Immediate purchase is welcome. I will ship it on the same day of purchase if possible, or at the latest, the next day. Thank you.