LOL.
"Audio Class Janpanese Super Capacitor"
They were stupid enough to put a picture of the innards too. Presumably the TO220 case IC is the 5V regulator for the 7 segment LED + A/D LED Driver ( the DIP ). I think the SHORI black block is some sort of relay. I can't see the cap labels, but they look like standard aluminum electrolytics. Even if they were super caps, 18WVDC would be huge. I have no idea how they could come up with 5F.