The First Alert PRC710 uses a photoelectric sensor ... if the alarm goes off while you're not home. Backup power: Hardwired smoke detectors require a backup battery to power the unit in the ...

Unlock to see our ratings and compare products side by side The First Alert SMCO210 (Battery) is part of the Smoke & Carbon Monoxide Detectors test program at Consumer Reports. In our lab tests ...

Winner: Hardwired with 10-year backup battery operation wins this round. The post Hardwired vs Battery Smoke Detector: Important Differences appeared first on Family Handyman.