A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors generally issue a local audible or visual alarm from the detector itself. Smoke detectors are housed in plastic enclosures, shaped like a disc. 

Sensitive alarms can be used to detect, and thus deter, smoking in areas where it is banned. Smoke detectors available on the market were designed to discover potential threats (smoke sensors save lives). Smoke can be detected either optically (photoelectric) or by physical process (ionization). Photoelectric smoke detectors respond faster to a fire in its early, smoldering stage (before the source of the fire bursts into flames). These detectors are more sensitive to the large combustion particles that emanate during slow, smoldering fires, which usually occur at night when people are asleep.

These detectors are designed to regulate the flow of air through the detector and eliminate or reduce the possibility for ingress of foreign matter and insects. These features help to reduce false alarms and improve the performance of smoke detectors. When smoke enters the chamber, it scatters the light, which then hits the sensor and triggers the alarm.

Features: