This is a USB DAC from TOPPING, a Hi-Fi audio brand from China. I used it on my office desk. I was using it with a Shirokuma Seisakusho OPA627AU installed. I've been transferred and no longer have the opportunity to listen to music at my desk, so I'm selling it. I have confirmed that it works. There are some noticeable scratches, so please refer to the photos. There is no outer box, so I will pack and ship the main unit only.