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The 713 Series smoke alarm is a photoelectric type unit for use as an evacuation device in residential applications, while the 710 and 720 Series are for use as an alert and relocate device. Each smoke alarm has a solid state piezo signal to warn and alert the household to the presence of threatening smoke. Your photoelectric smoke alarm is designed to detect the smoke that results from an actual fire. Consequently, it is uncommon for household smoke such as cigarette smoke or normal cooking smoke to cause an alarm.