The First Alert 120VAC Hardwired Smoke Alarm with Battery Backup works exceptionally well in detecting flaming fires. Capable of wiring directly into your home's electrical system, these alarms feature a near effortless installation process. This alarm comes equipped with a Mute Button that serves the dual purpose of quickly silencing your alarm as well as testing its function.
First Alert's series of 120VAC Hardwired Smoke Alarms with Battery Backups also come equipped with an EZ access battery door that removes the hassle and burden of collecting your alarm from the ceiling and replacing its batteries. The combination of a Battery Backup that provides optimal protection in the event of a power outage and an increased emphasis on the unit's 85d output establish the ultimate in peace of mind. This alarm comes with a 10 year limited warranty and complies with UL217 Standards. Save additionally with the purchase of this bundle.
This alarm is also capable of interconnecting with up to 12 other First Alert or BRK hardwired alarms.
This smoke & fire alarm is for you if:
Where To Place Safety Smoke Alarms:
Recommended replacement for the following obsolete models:
First Alert SA4120B
First Alert SA4121B
First Alert SA4919B
Average Customer Rating Based on 177 reviews:
Great service - 01/10/2018
Reviewer: jackie floen
No problem with orders, received exactly what I ordered, prompt delivery.
Reviewer: Kathy Romano
Easily replaced our existing alarms that are no longer working with these.
Reviewer: JoAnn Landry
Reviewer: Ian Montgomery
Replaced a 8 year old unit, fit and worked as expected. Glad they still make this model. Would have been a pain to install another style.
Low price, high quality and easy to install - 12/25/2017
Reviewer: Gangqing Hu
The price for the three sets of 120VAC hardwire alarm I ordered from First Alert beats anywhere else. The shipping was fast and the installation was easy and straightforwards as the model is compatibile with the ones to be replaced in my house.
really good product - 12/19/2017
Reviewer: Eileen Trainer
completely satisfied. Thank you.
Easy - 11/07/2017
Reviewer: Raymond Dunleavy
Dealing with the first alert store was great. Order came on time and people I dealt with were VERY HELPFUL. Smoke alarm was a replacement from an old one. Matter of changing electrical cable and plugging in. Easy
120VAC Hardwired Smoke Alarm with Battery Backup - 10/24/2017
Reviewer: Charyce Hill
I have 12 of this smoke alarm in my home, all of which have been perfect for the past 12 years. Had to replace only one unit as a plastic clip that holds the battery in place broke. Highly recommended.
Reviewer: donald kreindler
swapped out older alarms and it was seamless
Reviewer: donald kreindler
Very happy with this product. I used it to replace an existing one and it just slipped right into place.
Other reasons include: It could be a different device or appliance such as a security system, monitor, carbon monoxide alarm, or other device which has a similar low battery or alert signal. Some of the same factors that cause unwanted alarms can cause intermittent alarms: dust and insects in the alarm or power interruptions in hardwired alarms. Improper wiring on AC or AC/DC smoke alarms. AC alarms will chirp every 5 seconds if the interconnect wire is grounded. The orange interconnect wire should NEVER be grounded; it should only be used to interconnect other smoke alarms or compatible devices.