Customer Reviews For The Hardwired Interconnect Smoke Alarm with Battery Backup

Overall Rating

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5 customers recommend this product

Product Reviews

Bruce T
November 3, 2026
Verified Purchase
Smoke Alarm installed in home

It was easy to order a new smoke doctor to replace an older model which wasn't working. I also found it be easy to disconnect the old model and connect the new one as it had all the necessary parts, even a battery.

Robert P
March 27, 2025
Verified Purchase
Replacement EOL

It was time for new smoke detectors, they had been in service for 10 years +, they were starting to have problems.

Michael M
March 21, 2025
Verified Purchase
alarm with battery

works great, fit in old base plate

Barney Kalmas
January 6, 2025
Easy Replacement

Replaced all 6 of my aging 9120 alarms with this model. Same plug fitting an same mounting bracket so it was about as easy as it gets. I recommend the First Alert Store to all my friends as they are the only retailer I know of that actually takes the time to help you on the phone and answer your questions in English.

Timothy Henry
December 30, 2024
Verified Purchase
great replacements

The Smoke/Carbon Monoxide detectors I bought from the First Alert Store work great. Perfect fit to existing mounting brackets. AND... $40-$45 each cheaper than the big Home centers.

Product FAQs

Why Should I Install 8th Edition Smoke Alarms?

In a home fire emergency, every second counts. Modern homes tend to be built and furnished with lighter, synthetic materials that burn hotter and faster. These homes also may feature layouts with higher ceilings and open floor plans. This may result in less time for a safe evacuation if a fire breaks out. Escape times have reduced from 10-15 minutes in the 1970’s to 1-2 minutes today (NFPA). 8th edition smoke alarms are better at detecting fires in homes built and furnished with modern construction materials where fires can spread at a faster pace. Install 8th edition smoke alarms and create an escape plan with your family to help be prepared.

What is the #1 Reason Why Smoke Alarms Are Disabled?

The #1 reason why people disable smoke alarms in their home is due to nuisance alarms caused by cooking or steam leaving them unprotected (NFPA). Almost 3 of every 5 home fire deaths result from fires with no smoke alarms or no working smoke alarms (NFPA) so it is important to install and maintain your home’s alarms. Installing 8th edition alarms equipped with Precision Detection and following proper placement of at least 15 ft. away from cooking appliances will help reduce nuisance alarms.

Why Is My Smoke Alarm Beeping?

Smoke alarms can beep for the following reasons:

  • Low Battery: This is the most common cause. Most smoke detectors use a chirping sound (usually a single beep every 30-60 seconds) to warn you that the batteries are running low and need to be replaced. Don't wait until the alarm is silent - replace the batteries right away to ensure your smoke alarm continues to function properly.
  • End of Life: Smoke alarms don't last forever. If your smoke detector is beeping constantly or in a different pattern than the low battery chirp, it may be nearing the end of its intended lifespan and should be replaced altogether.

SMI100-AC Video Guide

Watch this helpful video to learn more about the First Alert Precision Detection Interconnect Hardwired Smoke Alarm with Battery Backup - SMI100-AC (1046840).

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