A fire alarm is a unit made of several devices, which uses visual and audio signalization to warn people about a possible fire, smoke, or carbon monoxide occurrence in the area of coverage. Fire alarms are usually set in fire alarm systems to provide zonal coverage for residences and commercial buildings. The warning signal is either a loud siren/bell or a flashing light, or it can include both. Some fire alarm systems use additional warnings, such as sending a voice message or making a phone call.
Depending on the functionality and the integrated components, there are several classifications of fire alarm systems.
Fire detectors can be heat, smoke or carbon monoxide sensors. They are placed around the building to trace the presence of such emergencies.