BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack

The best smoke for your money. Why pay big nox prices when you can get the same model from Amazon cheaper. These smokes are very easy to install. The are reliable and clean looking.

This is my second smoke and fire alarm from this brand, and once again, it delivers exactly what I hoped for. The sleek design fits perfectly and blends seamlessly with the aesthetics of my home—no bulky eyesore here. Installation was a breeze, taking just a few minutes, and it even comes with a 9V battery included, which is a thoughtful touch. Reliable, stylish, and easy to set up—this alarm checks all the boxes for safety and convenience.

I researched various brands of smoke detectors and decided based on reviews and other factors (UL ratings) that the First Alert / BRK brand was the best and most reliable. I also read about ionization vs photoelectric sensors, and that many different websites recommend having a smoke detector that has both types of sensors installed in a single unit to alert to both types of common house fires (smoldering vs rapid flame combustion). I found the First Alert model smoke detector with both ionization and photoelectric sensors would not work in my application, as the combination sensor smoke detector is battery powered only. The smoke detector configuration in my home is hard wired. So I decided to purchase the First Alert Model SMI 100-AC, which has the ionization type sensor only, and is equipped to be hard wired and has 9 volt battery backup. The smoke detectors I was replacing were USI brand and the old pigtail was not compatible with the First Alert brand. So all 7 of my smoke detectors needed the new hire wire pigtail installed that comes with the First Alert detector. I found this job to be very easy and instructions for installation were very straightforward. Took me a total of about 2.5 hours to rewire all pigtails and install all 7 new detectors. I tested each new detector individually as each was installed, and then again as an interconnected series across the complete circuit. All worked perfectly and all are showing solid green LED, which indicates they are all receiving AC power and alarm and battery backup are working and active. The green LED light is very subtle and does not cast any light at all in a dark room that would be considered bothersome or glaring. Very happy with my choice and I highly recommend to anyone needing to install new smoke detectors or replace old ones that have reached end of life like mine.

I changed my smoke detector to this one because the other one used 6 AA batteries so every month I had to change them. Way too expensive.This one has a green light that I quite don’t understand why but when I move on my bed at night becomes brighter. Is there a way to change it? That is why I gave a 4 stars. Other than that it’s great. Easy to install and put in place.

Replacement for an existing smoke detector and it was simple to install.

These Smoke Detectors by design have not changed in quite some time which I appreciate! I found two bad ones this years annual check, but the system wiring is from 2013. These units are direct plug in with original wiring and plugs. They come with 9v batteries too! Works as intended. Price is right and functionality match existing units.

I recently bought this smoke alarm for one that went faulty...make sure the model number matches the replacement...overall it was easy installation...works great for my home....

Mine was ten years old and started beeping to let me know.This fit the original base and wired plug perfectly .All of two minutes to install…took longer getting the ladder than installing.