What is this?

i had one of those on a 73 buick, dealer installed! it was like an old school bell/fire alarm bell mounted up under the hood on the inner fender. the bump sensor had a key switch on the fender that you turned it on and off with. when it was activated it rang continuously until you keyed it off to reset.

i imagine that this one is a momentary that has a stuttering honk as it bumps along.