If you are searching for reviews about smoke alarm, then this is where to find it. Gentex Hard Wired Ceiling Mount T3 Smoke Alarm with Backup might be your best choice. Check out this review and buy it by clicking the button below right now before this promotion finishes. Current price is 124.01 . The 7139 for ceiling mount is a photoelectric single station smoke alarm designed to give reliable early warning of the presence of smoke where both audible and visual alarms are required- This model is hard-wired so you would need an electrician to hook it up-The smoke alarm operates on the light scattering principle, a superior method of detection in smoldering fires- It has a pulsing LED light source and a photodiode sensor in a fully screened sensing chamber- When smoke enters the chamber, the infrared beam is deflected onto the sensor- The LED rate increases to 8 times the normal pulse rate, and after the photodiode confirms the presence of smoke for 2 consecutive pulses, it will produce
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