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Designed to help promote household safety, the First Alert 9120B Hardwired Smoke Alarm with Battery Backup can provide a vital early warning of fire. This hardwired smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast-flaming fires.
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Smoke detection technologies
Single button for testing and silencing
9 volt battery back up
Latching alarm indicator, remembers which unit initiated an alarm
Perfect mount allows for easy installation
Meets new construction requirements
Average rating:4out of5stars, based onreviews
1-2 of 4 reviews
it's worth every penny
Average rating:5out of5stars, based on0reviews
Very affordable and handy , it does the job pretty well. i will buy more for the rest of my house.
This first alert model 9120B works great until your first battery backup replacement. After a new battery change it beeps continuously. I filmed all the instruction to take the new batter out and press the tester until it clears the memory however upon replacement it still beeps every 15 min or so. So now I have a hole in my ceiling. These are a piece of crap and now I have a hole that cannot be repaired. I purchased a replacement and it did the same thing.
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