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 ...

This Kidde RF-SM-DC smoke detector performs excellently in CR’s flaming ... One of the few plug-in CO detectors in our ratings, the First Alert CO615 beats out its hardwired brethren, with strong ...

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 ...