It's not a mystery siren, but it's a mystery controller!

[KidCrazer14 Official]

This one is used at the Melrose Fire Department in Melrose, NY to activate the station's mighty Thunderbolt! I've been best friends with them since they let me set it off for my 13th birthday last year! They even told me that I'm always welcome to come watch the Thunderbolt! (That's why I was able to take a photo of the controller that you see here) I don't know the controller model name or anything, it might be custom, if anyone out there knows this controller model, please let me know, thanks!

[flatlandsparky]

It certainly looks like it was custom built by the fire alarm system installer.

[amtrak33]

I'm not sure of the model but thats awesome!

[nvanw27]

That appears to be custom that either ties into a timer located somewhere else or that just ties directly into the Thunderbolt. Very interesting for sure!

[carolinasignalco]

those are custom engraved plates. im working on a machine that does just that. its a regular fire alarm controller box too. it is hommade