7109CSC Gentex Smoke Alarm - Hard Wired with Battery Backup Ceiling Mount

All the same features and quality as the other Gentex smoke alarm models, with the addition of battery backup. Battery backup operates audible alarm only. This 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 need an electrician to hook it up. One Year Manufacturer's Warranty.

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 the signal necessary to trip the audible and strobe light alarms.

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