blot fire Smoke Detection Sensor System with Alarm For Home,Hotel, Apartment Gas Detector Smoke and Fire Alarm  (Wall Mounted)

A smoke detector is a safety device designed to detect the presence of smoke, typically as an early indication of fire. It sounds a loud alarm to alert occupants, allowing time to evacuate and respond before a fire spreads. Smoke detectors can be powered by batteries or hardwired into a building's electrical system, often with backup batteries for reliability during power outages. There are two main types: ionization smoke detectors, which are more responsive to flaming fires, and photoelectric smoke detectors, which are better at detecting smoldering fires. Many modern smoke detectors combine both technologies for enhanced protection.