This is an old alarm or changing shift brass bell. It is connected to the original metal plate. This would have to hooked up to some sort of current for it to work. The bell and the plate are in great condition. The name on the metal plate is Faraday, and t is a number 1038. The total length is 7 3/4", and the bell diameter is 4". Buyer pays postage, extra if outside the USA.