Even though your smoke detector is hard wired to the homes electrical system the smoke alarms still contain a 9 volt backup battery.
Electric smoke detector with battery backup.
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.
For pricing and availability.
First alert ac hardwired 120 volt smoke detector.
The reason those batteries are there are as a backup.
Ionization sensor reliably detects flaming fires.
This hardwired smoke detector uses an ionization smoke sensor to reliably detect smoke from hot fast flaming fires.
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.
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.
Designed to help promote household safety the first alert hardwired smoke alarm with battery backup can provide early warning of fire.
Find smoke detectors at lowe s today.
If your house loses electricity the smoke detectors will still work.
First alert 2 pack battery operated 9 volt smart smoke detector.