Theres a lil project i did for our props banks when we goin in convention and events.
I wanted to replicate the Janine’s Alarm Button with a real working bell alarm. I used a small 110v alarm bell, i didnt used a real firefighter alarm bell caused it would be too loud for convention, we wont create a panic attack with it 
I just hide the bell in my Diamond Select Ghostbusters Logo bank, i removed one side and fill it with a plexiglass plate full of hole to let the sound pass.
I think its a cool lil props with some interactive fun
P.S. Sorry im speaking French in my video, was too lazy to redo one