(2) Nutone Wireless Security Alarm System S-5522 Vintage Scovill S2291 1976 These both power on, the green lights work, I don't know how and don't have what is needed to test further, you're buying for parts or not working. One of them doesn't have a fuse/fuse holder, or a back compartment door. I just put the fuse in it to test for powering on. The bodies are in good shape, there are a few marks/scratches, nothing too bad. One has a little bit of white paint on it. There are 2 S2291 speakers I guess they are included, they use 9 volt batteries and there are corroded batteries in them (at least the one that I opened up).
If you're local to west Cincinnati, you can pick these up and save the shipping time and cost.