A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial smoke detectors issue a signal to a fire alarm control panel .
Features:
Made of poly-styrene plastic No wiring is required for any connectivity
Area covers 4.5 mtr. with 10 to 11 feet height
Operates on 9V Alkaline Battery
Comes with TEST butt on Blinks in every 35 seconds