Customer Reviews For The First Alert Hardwired Smoke Alarm with Battery Backup
very affordable and easy to install
All you need in the box. Is wired and interconnected with an easy to access 9v battery for easy battery change. Install 4 of them in my apartment and they are working really well. Will buy again for sure.
It just works! This is the only brand I trust with my life.
very good product that last s up to 10 years
The product was exactly as it said it would be , fast shipping! I am totally happy and I’m planning on ordering more! Thank you First Alert!
I ordered four to replace my old ones. Super easy to install. As always, make sure you have turned the breaker off prior to replacing/installing.
I have ordered this product in the past very pleased. Just moved to New home and had to replace some of the smoke detectors. I got 5 of this product and quality and ease of installation is amazing. Highly recommended. Ordering and service was excellent.
Great fire alarms. Just needed to replace 10+ year old ones in my apartment.
Easy to install. Fast shipping.
These are the best and easiest to install. Great product and great service. Thank you
The best quality, reasonable price fast service.
Easy to install if you have minimal electrical knowledge. Just be sure your power is turned off to avoid electrical shock. If you are not comfortable around electricity hire someone who is qualified. A+++
I was very pleased start to finish with my order. These are very easy to install. Excellent customer service
I purchased this product from First Alert Store to replace an alarm that had aged out. The price was very reasonable, it shipped and arrived very quickly and it was easy to install. What more could you ask for!? I will be buying all of my smoke alarms from them.
The 9120B smoke alarm arrived promptly and was very easy to install. I am very satisfied with the purchase.
Easy product to install and was shipped right away!
Alsome fast and reliable products
Alsome fast and reliable products
I love my First alert smoke detector. I love the fact that I can order directly from the company and not have a middle middleman.
Just installed the 9120B Smoke Alarm after painting the hallway celling. This model was the replacement for the smoke alarm that was installed in the celling since 1992, it was really time to update it and it was very easy to do. The alarm looks great and it appears to be doing what it suppose to do, monitoring for a fire. I like it, no false alarms and I think it will last 10 years with no problem.
- You may not be holding the test button down long enough. Try holding it down for up to 10 seconds (20 seconds on photoelectric models) .
- Your battery may not be installed properly or snapped all the way in place. Even if the alarm sounded briefly when the battery touched the terminals, you still need to make sure it is snapped securely in place. If the battery is loose, in cannot power the smoke alarm properly. After installing new batteries, be sure to test your smoke detector.
- Your AC power may not be on. AC and AC/DC units will have a power indicator light (red or green) that shines continuously when they are receiving electrical power.
- If you have a 10-Year model, the smoke alarm may not have been properly activated. If the tab broke away before the alarm was activated, you can use a toothpick to move the switch over to test the alarm.
- There may be insufficient battery power, try new batteries.
- Problems with voltage or insufficient electrical power (brown out) may cause a continuous weak sounding alarm. For AC or AC/DC models, temporarily disconnect power at the service panel until the brown out is over. If you do not restore the AC power, your smoke alarms cannot warn you of a fire.
- Incompatible warning device. If an incompatible alarm or auxiliary device is linked into a series of AC or AC/DC smoke alarms it may cause the system inadvertently go off.
Hardwired Smoke Alarm with Battery Backup:
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.
Ionization Sensor Reliably Detects Flaming Fires
The First Alert 9120B Hardwired Smoke Alarm with Battery Backup comes equipped with an ultra-reliable ionization sensor to provide the earliest possible warning of a fast-flaming fire. The sensor is optimized to detect flaming fires, such as those caused by paper, kitchen grease, and other fast-combusting materials.
Gasket-less for Easy Installation
To facilitate hassle-free installation, this smoke alarm features a streamlined mounting system with a gasket-less base. The mounting bracket keeps the alarm secure over a wide rotation range while maintaining perfect alignment. The alarm also comes with a dust cover to keep the unit clean during construction. AC-powered smoke alarms must be installed in accordance with all local electrical codes.
Battery Backup for Detection During a Power Outage
This smoke alarm is designed for hardwired installation, but it also features a battery backup that helps ensure continued functionality in the event of a power outage. The unit comes with a 9-volt battery and features a pivoting, easy-to-access battery drawer that allows you to replace the battery without dismounting the alarm.
Works in Tandem with Other First Alert Alarms
In addition to functioning independently, this smoke alarm can also integrate with up to 12 other First Alert or BRK hardwired alarms for coverage of larger spaces. It also integrates with up to six other compatible devices, such as bells, horns, and repeaters. If one alarm in the series is triggered, they will all sound. The alarm features a latching indicator to identify which unit triggered the alarm, alerting you to the area of danger.
First Alert Smoke Alarm 9120B
Recommended replacement for the following obsolete models:
BRK 4120B
BRK 4120SB
BRK 86RAC
First Alert SA4120B
First Alert SA4121B
First Alert SA4919B
