I am selling this item, which I purchased on September 29, 2025, as I no longer need it. I inserted it once, but it is in very clean condition. Of course, I have confirmed the connection. I can't find the instruction manual, but I don't think it's particularly necessary. The included USB cable is available. FX-AUDIO DDC with USB input, supporting optical digital and coaxial output. - Model Name: FX-D03J - Input Type: USB - Output Type: Optical Digital/Coaxial - Brand Name: FX-AUDIO Thank you for looking.