That's a USB sound card or, how Onkyo calls it themselves, an `Out-of-the-Box Digital Audio Processor`. I planned to use it to get coax S/PDIF from my laptop (for ART DI/O) and it does that perfectly. Never tried using its analog section, CNET says it's good. We all know CNET.
Comes with everything it originally came with: manuals, CD with drivers, USB cable, some analog RCA-terminated interconnects.
Selling because in a few months I had it I only used it once to test if it works. It does.
I'm too lazy to dig that thing out to make a photo, so there, drool on the official one: