Unknown sounder

Security System Help
1

Does anyone know what sounder this is: https://www.youtube.com/watch?v=VHP58XC5wq4&t=106s it makes a hi lo sound that I’ve never heard before.

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2

I believe it’s a ATC mini horn.

3

I can’t find it. Anyone know the model number?

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4

What’s the model number?

5

Not 100% sure. I’ll do some more research later.