Generic round fire alarm sounder

A fire alarm is a an electronic sounder or a bell. The sounder makes a loud high pitched sound to alert people that there is a fire in the building. The sounders can be programmed to sound different tones. Most fire alarm sounders in Europe sound like a siren. The bell makes a continuous ringing sound.A fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are present. These alarms may be activated automatically from smoke detectors, and heat detectors or may also be activated via manual fire alarm activation devices such as manual call points or pull stations. Alarms can be either motorized bells or wall mountable sounders or horns. They can also be speaker strobes which sound an alarm, followed by a voice evacuation message which warns people inside the building not to use the elevators. Fire alarm sounders can be set to certain frequencies and different tones including low, medium and high.