A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors/Alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary.
Smoke can be detected either optically () or by physical process (). Detectors may use one or both sensing methods. Sensitive alarms can be used to detect and deter smoking in banned areas. Smoke detectors in large commercial and industrial buildings are usually connected to a central .
Household smoke detectors, also known as smoke alarms, generally issue an audible or visual from the detector itself or several detectors if there are multiple devices interlinked. Household smoke detectors range from individual battery-powered units to several interlinked units with battery backup. With interlinked units, if any unit detects smoke, alarms will trigger at all of the units. This happens even if household power has gone out.
Residential smoke alarms are usually powered with a 9-volt battery, or by . Some smoke alarms use a combination of the 2; usually using the 9V battery as an extra power source in the event of an outage.
Commercial smoke detectors issue a signal to a as part of a fire alarm system. Usually, an individual commercial smoke detector unit does not issue an alarm; some, however, have built-in sounders.
The risk of dying in a residential fire is cut in half in houses with working smoke detectors. The reports 0.53 deaths per 100 fires in homes with working smoke detectors compared to 1.18 deaths without (2009–2013)
.Professional design, fast perception of fire supported that ensures high sensitivity of smoke and temperature, effectively reduce false positive rate and make the police more accurate.