The reason those batteries are there are as a backup.
Electric smoke detector with battery backup.
Kidde firex hardwired 120 volt front load smoke detector with battery back up and adapters twin pack 29 97 14 99 unit 29 97 14 99 unit alarm sensor type ionization.
Ionization sensor reliably detects flaming fires.
Designed to help promote household safety the first alert hardwired smoke alarm with battery backup can provide early warning of fire.
These alarms are equipped with two pre stripped wires for easy installation and have a 9 volt battery backup to ensure continued use during a power failure.
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First alert ac hardwired 120 volt smoke detector.
First alert 2 pack battery operated 9 volt smart smoke detector.
Hard wired smoke alarms are wired into your home s electrical system.
Many prefer to play it safe with a hard wired system that also comes with a battery backup available for less than 20 per unit.
Homes without smoke detectors or with detectors that have faulty or dead batteries are one of the main reasons people get trapped in fires.
This hardwired smoke detector uses an ionization smoke sensor to reliably detect smoke from hot fast flaming fires.