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This item: First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack
$16.99
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$12.69 ($1.59/count)
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$34.98
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Customers say
Customers find the smoke alarm easy to install and appreciate its loud, piercing notification signal that provides peace of mind for fire safety. Moreover, the product receives positive feedback for its quality and value for money. However, the reliability and battery life receive mixed reviews - while some say it works flawlessly with Ring detectors, others report it only working for two months, and while it comes with a battery, some units arrive with dead batteries. Additionally, the wiring aspect is negative, with customers noting there's nothing for the plug to connect to.
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209 customers mention quality, 154 positive, 55 negative
Have had first alert alarms for 40 years. Never failed me yet. Great product, great price.Read more
...Seems to be a good product but if it arrived broken or anything else, you are stuck.Read more
Its a smoke alarm. Hard to review when they only work in an emergency. Hopefully I will never have to find out....Read more
Great price, good quality , easy installation to replace our old hard wired smoke detectors.Read more
200 customers mention installation, 193 positive, 7 negative
This is easy to install, it is supposed to last for years which is a plus and customer service was very easy to get ahold of and responsive when it...Read more
Clean look, easy install, hesitant on quality if it actually working....Read more
It was super easy to install, and the test/silence button is a convenient feature. The alarm is loud and clear exactly what you want in an emergency....Read more
These are perfect. Easy installation and easy to monitor 👌.Read more
123 customers mention value for money, 111 positive, 12 negative
Great price, good quality , easy installation to replace our old hard wired smoke detectors.Read more
There are 2 great things about this smoke alarm, other than the good price. 1. The battery is included....Read more
...Great value for a reliable, no-fuss smoke detector. Definitely recommend it if you're looking for a simple and effective replacement!Read more
...They were affordable, easy to install, and work exactly as expected....Read more
44 customers mention loud, 32 positive, 12 negative
...The alarm is loud and easy to test while standing on the floor with a broom handle.Read more
...It came with a battery, too. The price was right. It has a loud alarm, which is what you want.Read more
Works as it should. Loud and sensitive to even a small amount of smoke from cooking....Read more
...They are loud enough to wake the dead, which is good because I am a heavy sleeper. They fit in the same frame as my old smoke detectors.Read more
40 customers mention safety, 33 positive, 7 negative
248 customers mention reliability, 169 positive, 79 negative
Easy to install and works great. It’s already installed on the wall and working perfectly. Very satisfied with this smoke alarm.Read more
...looking to replace an outdated or constantly chirping detector with a reliable, standalone safety device, the First Alert SMI100 Battery-Operated...Read more
Doesn’t work and no returnsRead more
Works well. Had a little smoke while cooking and set off alarm.Read more
119 customers mention battery life, 60 positive, 59 negative
...Installation was incredibly easy since they are battery operated, so there was no wiring needed. I had both alarms mounted in just a few minutes....Read more
low battery alert after six months even with new batteriesRead more
Comes with battery, could not find this on the info. Great packaging Nice unitRead more
battery died after 3 months not impressedRead more
41 customers mention wiring, 9 positive, 32 negative
These have been good for me. But this one did not hook up like my old one did.Read more
...there were no descriptions or pictures of the connectors and it does not connect.Read more
...it easy to order the incorrect part only to discover they do not have the pins for plug-in. Add to that the fact that they cannot be returned....Read more
...No wiring needed. And very good quality. I really liked that the lifespan of the US is 10 years opposed to the traditional seven.Read more
Good battery saving smoke detector
So far so good, what I love the most is that it doesn't have a constant green light on like the one I used to have. This one flash once every minute. I think that saves some energy usage and make the battery more long lasting. Easy to setup once you read the instructions at least 3-5 times lol, it took me like 10 mins to setup. The instructions were a bit confusing at first, the pictures weren't really explaining anything, you have to read the long-written instructions to be clear on the steps. I did not put in the plastic screws to secure the detector as instructed, I only drilled in the metal screws and it's sitting in the ceiling just fine.
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Top reviews from the United States
Brilliant nuisance-alarm reduction and incredibly easy battery maintenance!
Reviewed in the United States on May 20, 20267 people found this helpfulWorks. After you replace included dead battery
Reviewed in the United States on May 22, 20264 people found this helpfulReliable Smoke Alarm That Was Quick and Easy to Install
Reviewed in the United States on March 4, 202624 people found this helpfulGood battery saving smoke detector
Reviewed in the United States on May 27, 2026
Good battery saving smoke detector
Reviewed in the United States on May 27, 2026So far so good, what I love the most is that it doesn't have a constant green light on like the one I used to have. This one flash once every minute. I think that saves some energy usage and make the battery more long lasting.
Easy to setup once you read the instructions at least 3-5 times lol, it took me like 10 mins to setup. The instructions were a bit confusing at first, the pictures weren't really explaining anything, you have to read the long-written instructions to be clear on the steps. I did not put in the plastic screws to secure the detector as instructed, I only drilled in the metal screws and it's sitting in the ceiling just fine.
2 people found this helpful
