It's a 9/12 siren, but it's probably not an Allertor, since it doesn't sound like it's rotating. It could be a Model xT, an SD-10, or even a Banshee. It's running a little slow, so I'd say it's either single phase, or sickly. That's gotta be an SD-10 or 5T with that Thunderbolt. Whatever combo it i...