It's not a fact of protection, it's just that me and my roommate here are trying to collect as much useless crap by the end of the year. We just bought a 4-channel light controller (120vac plugin lights only) and a rotating blue beacon plus a party strobe light to go along with it. I was hoping to get a siren that would work with the controller without a convertor just so that I could have a siren in the collection ^.^ but we also wanted to have an electronic chime or something like that for channel 4. So, it would be rot. light channel 1, strobe channel 2, siren channel 3, buzzer/chime/flashing light next to door channel 4.
If you have any useless emergency equipment you see that would work (from eBay or something) that is not extremely loud (or can control or muffle the volume) go ahead and tell me.