Customer Reviews For The Hardwired Interconnect Smoke and Carbon Monoxide Alarm with Battery Backup

Overall Rating

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5 customers recommend this product

Product Reviews

Sharon C
June 2, 2026
Verified Purchase
Quick delivery and install was easy...

I was happy I could find replacement smoke/co detectors for the "end-of-life" devices in my home. The product arrived quickly and was easy to install.

David Z
April 7, 2026
Verified Purchase
Simple swap

Our original First Alert alarms reached their 10-year useful life so we replaced them all. These are slightly smaller in diameter than the originals but still very easy to swap out. Had to R&R the circular mounting plate which consist of loosening two screws (very easy) and installing the new mounting plate and retightening the 2 screws then plug in the alarm and it screws right on to the new mounting plate. It takes about 5 minutes per unit to swap one out.

Michael E. B
December 4, 2025
Verified Purchase
Customer Review

This is my second purchase from the First Alert Store. It is also my second replacement #1046874 Alarm. I am quite comfortable using the web site for ordering. My orders are received in a very timely manner. The installation is easy to complete. Should I need a third replacement alarm, it will be ordered from the First Alert Store.

David Z
September 29, 2025
Verified Purchase
Easy order process and installation

Very easy order process. Installation was a breeze, less than 5 minutes per unit. Replaced 4 alarms that reached end of life.

John S
November 4, 2024
Verified Purchase
Have not used it yet

It is an exactly what I will need. Have not replaced old one yet as it still has some life in it. Glad I have the replacement now.

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.

SMICO100-AC Video Guide

Watch this helpful video to learn more about the First Alert Precision Detection Interconnect Hardwired 2-in-1 Smoke and CO Alarm with Battery Backup - SMICO100-AC (1046874).

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