0.75 meter (2' 5") USB 2.0 digital cable terminated A>B (that's the regular rectangle plug and the regular square plug, see pictures).
The DSS battery is still good, see pics for it lit up.
Everything that came with it is included.
Bought new 2 years ago, installed during that time and used for maybe 10 hours in an unsatisfying and problematic ROON installation. It all sounded great when it worked, it just didn't work all the time...
The fix for the install made this cable, and an Aurender USB > S-PDIF converter etc. I also have listed, unneeded.