This protective cover has been helping stop false fire alarms for over 30 years without restricting legitimate alarms. It consists of a clear polycarbonate shield and frame that fits over manual pull stations. When lifted, models with a horn sound an alarm until it is reset. It is designed to deter vandalism while allowing emergency responders to be alerted during a real fire. A variety of models are available for indoor or outdoor use with options like horns, spacers, and relays. It has undergone extensive safety testing and certification.