Vintage Automatic FYR LARM whistle. This vintage whistle is solid and sturdy. It is free from any rot, punk, or soft spots. One of these vintage devices would have been placed on each floor of your home. When the temp reached approx 136 degrees it would active a loud whistle alerting people in the house of a fire. The unit has NOT been tested. I do not know if it does or does not work. Unit is 14" Tall