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 mayalso 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, depending on the country
and manufacturer of the device.
Most fire alarm systems in Europe sound like a siren with alternating frequencies.
Fire alarm electronic devices are known as horns in the United States and Canada, and can be either
continuous or set to different codes.
Fire alarm warning devices can also be set to different volume levels.