Customer Reviews For The Precision Detection Interconnect Hardwired Smoke Alarm with Battery Backup

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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.

What is the UL 217 8th Edition Smoke Alarm Update?

UL Solutions has updated its smoke alarm standards requiring smoke alarm manufacturers to meet new requirements by June 30th, 2024, to reduce nuisance alarms and detect smoke from synthetic materials. This update is known as UL 217 8^th Edition and helps to improve fire protection for modern homes. As a leader and the most trusted brand in fire safety*, First Alert has introduced Precision Detection advanced sensing technology to meet new UL 217 8^th Edition industry standards. First Alert Precision Detection Smoke Detectors and Combination Smoke and Carbon Monoxide Alarms are available for online purchase at the First Alert Store.

*First Alert Brand Trust Survey, March 2023 – Results are based on the responses of 1,043 adult homeowners, ages 25 and older, living in the United States who completed an online survey asking them to choose from six brands in the smoke, fire and carbon monoxide protection space.

Why Should I Use First Alert Precision Detection?

Our new advanced sensing technology complies with UL 217 8^th Edition smoke alarm standards to reduce cooking nuisance alarms and provide an early warning in the event of a home fire emergency. Current smoke alarms will continue to provide protection until they reach their end of life. However, when it’s time to replace the smoke alarms in your home or you want to upgrade to the latest technology, look for Precision Detection to help identify compliant First Alert alarms. Smoke alarms should be replaced at least every 10 years.

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). 8^th 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 8^th 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 8^th 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 to 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.

Interconnect Hardwired Smoke Alarm with Battery Backup

The First Alert SMI100-AC Interconnect Hardwired Smoke Alarm with Battery Backup meets new industry standards utilizing First Alert's Precision Detection advanced sensing technology. This hardwired smoke detector is easy to install. There is no need to rewire when installing this smoke detector. Interconnect compatible alarms create a whole home alarm system to help provide an early warning.

Early Warning Interconnect

In addition to functioning independently, connect multiple hardwire detectors together to create an alarm system throughout your home. When one interconnect alarm sounds, all connected detectors will sound to help provide an early warning and time to safely escape. Integrate with up to 12 other First Alert or BRK detectors and 6 other compatible devices. Please reference user's manual for compatible alarms. If the alarm system sounds, the latching alarm indicator will visually identify the unit that initiated the alarm.

Hassle-Free Installation

Easily install and replace existing hardwired smoke alarms by using the hardwire quick connect plug. There is no need to rewire into your home's electrical system. Although the First Alert SMI100-AC interconnect smoke alarm is designed for hardwired installation, it also features a battery backup to help provide continuous protection in the event of a power outage. Discourage unauthorized removal of the backup battery or alarm by using the optional locking features.

Easy to Maintain & Test

Use the test/silence button to test smoke detector regularly. This will help ensure it is working properly and also silence false alarms. A low battery alert will let you know when it's time to replace the backup battery and the end-of-life warning will let you know when it’s time to replace this 8th generation smoke detector completely. See user's manual for information on how and when to test and replace alarms.

Upgrade to 8th Generation Alarms

First Alert's Precision Detection Advanced Sensing Technology meets the latest safety standards set by UL 217 8^th Edition. This means this smoke alarm is better at distinguishing between harmless cooking smoke and real fires. Additionally, 8^th edition smoke alarms can detect smoke from burning synthetic materials, which are common in modern homes. This translates to fewer bothersome false alarms and a crucial early warning in case of a fire emergency.

First Alert Interconnect Hardwired Smoke Alarm with Battery Backup SMI100-AC

Recommended replacement for the following model:

9120B