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Photoelectric smoke alarms are generally more effective at detecting smoldering fires, which smolder for hours, before bursting into flames. Sources of these fires may include cigarettes burning in couches or bedding.
This alarm requires constant 220-240V AC 50Hz mains power suplly to operate properly. Backup 9V DC battery will offer additional protection in the event of power failure. It will NOT work if AC power is not connected or has failed or been interupted for any reason.