Good find ! Never saw that before and I've watched a lot of Chernobyl videos!

Definitely a type B, motor shroud is a dead giveaway

Your kidding me right???? Those people are being invaded and are being killed and YOU are discussing what the damn sirens sound like??? I realize this is NOT a political site, and that sort of stuff should not be discussed here.. But for Christs sake, try to be just a little respectful of the fact ...

Sounds a lot like a 10 port french siren, for me it sounds like exactly a S40 siren

I already seen this picture before, but honestly I don't think it's a siren, because it looks so small and doesn't even have projection horns Maybe it is a siren but no documentation or other pictures of it exists Maybe the photographer thinks it's a siren but it's not, it's like the video of someon...

Someone in the comments says that it's a 5T and it's the one of the owner of the board (Adams)

Exactly, explosion proof air raid siren, mostly for inside use I think since of its size, I think it's the kind of sirens that they use in big factories

These are not Decots. They are Scream Masters. That was solved five years ago. https://www.airraidsirens.net/forums/viewtopic.php?t=19871 A scream master in washington? Scream master are not little sirens like the one on the original post... so no, it's not a scream master, they look very different...

Looks strangely like a Decot siren ! For me that's a good bet

It's pretty difficult to say what is this siren on the top, you should take a good camera and take a picture of it