Audio interface with various connection options. - Model: US-366 - Input terminals: 2 - Output terminals: Line out, Headphones - Digital I/O: Optical, Coaxial - USB connection: Yes - Mic/Guitar switch: Yes This interface has been used for over a decade. A replacement PC has arrived, and although sound can be heard via USB on the currently used PC, I haven't been able to confirm its operation. I haven't been able to determine whether the problem is with the drivers or the unit itself. It was working on the previous PC.