True Alert Speaker Strobe With a electromechnical horn?!

I was walking on my way to work and I saw a day care conducting a fire drill.

So I saw the speaker strobes but it sounded like a 4903 horn! Sure enough when I went up to the unit after they were done it had a horn inside it! I unfortunately didn’t have my camera with me so no pictures. But is this possible to have a electro horn behind a speaker strobe body?

You sure it wasn’t a tone designed to simulate an electromechanical horn for easy recognition?

What kind of alarms were they?

This. It sounded like the 4093 Electro-mechnical Horn

Now that’s interesting. If you can go back and take pictures, please do.