Grandpa left this too me very rare and unique

It's a Signal Corps US Army Alarm horn from WW2, My Grandfather left to me in his will. This probably saved alot of lives back then. From what I've read about it, its very rare. I think it is a very cool and unique piece. It was manufactured in Adrian Michigan by the Faraday
Electric Corporation. I find that fascinating that a electric Corp made something like this. I'm very honored to own this piece of Military history. If it could talk about what it has been through and seen. Imagine what it would say.