Two vintage fire alarm heat detector bells from the Vanguard Protection System. They are a wind-up type alarm, Model V2-25 FT, and have a fusible link on the front of each one that is set at 136 degrees Fahrenheit. They are complete and have never been set off. Each is a 6" diameter bell and weighs approx. 3 lbs. Normal wear from being well-used and painted around for many years. Please see photos for condition. Includes mounting brackets and screws. A nice addition to any collection.