I recently stayed at a rental property that had this (actual photo):

I tried to get it working but none of the remote panels worked. They were all disconnected somehow (owner probably cut the wires to prevent shenanigans by guests cranking the volume then leaving it like that). The CD player worked (central panel only) but oddly, it couldn't pick up any FM stations. It would tune to them ("scan" feature worked) but they only ever produced static. I suspect the capacitors used in the amplification circuit dried out or something got corroded after being in a "regular ocean salt spray" area (it was on a beach) for such a long time 🤷