Details: Photoelectric smoke alarms are quicker at sensing smoldering fires than Ionization smoke alarms. A photoelectric smoke alarm consists of a light emitting diode and a light sensitive sensor. The presense of suspended smoke particles in the chamber scatter the light beam which sets off the alarm. Features: Optical Smoke Detector 85dB Alarm Signal (3 metre) Continuous Monitoring Easy Assemble - No Wiring Low Battery Indicator Test Button Includes 9v Battery
