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. Fire alarms are usually set in fire alarm systems to provide zonal coverage for residences and commercial buildings. A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors in large commercial, industrial, and residential buildings are usually powered by a central fire alarm system, which is powered by the building power with a battery backup. Fire alarms are found in Homes, Offices, Factories, and public buildings, they are a part of our everyday routine. The Best of Zambia lists Fire Alarms here.