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The First Alert SMI100 Battery Smoke Alarm features advanced Precision Detection technology that reduces false alarms, a battery-powered design for easy installation and reliable operation during power outages, and a front-access battery compartment for hassle-free replacements. It includes an end-of-life warning and a test/silence button, making it a trusted, user-friendly choice for modern home safety.











| ASIN | B0CJLN45JZ |
| Alarm | Smoke |
| Best Sellers Rank | #54 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Smoke Detectors & Fire Alarms |
| Brand | First Alert |
| Built-In Media | 9V Alkaline Battery |
| Color | White |
| Customer Reviews | 4.6 out of 5 stars 5,798 Reviews |
| Item Dimensions D x W x H | 5.6"D x 5.6"W x 1.9"H |
| Item Highlight | SMI100 |
| Item Type Name | Smoke Alarm |
| Item Weight | 9.6 ounces |
| Manufacturer | Resideo |
| Mfr Part Number | SMI100 |
| Model Number | SMI100 |
| Number of Items | 2 |
| Power Source | Battery Powered |
| Product Dimensions | 5.6"D x 5.6"W x 1.9"H |
| Product Style | Precision Detection |
| Sensor Type | Ionization |
| Style | Precision Detection |
| UPC | 029054022400 |
| Unit Count | 2 Count |
R**C
Very pleased with purchase.
Very pleased with this purchase. Packaging was great. Bought this as used and they were in original condition. Batteries were new so nothing had been used or previously installed. I had purchased a First Alert before for my camper from Camping World. It came with a Duracell battery. These did not. I opted for a yeary battery change vs. the 10 year internal battery. I had the 10 year (not First Alert), and they only lasted 4-5 years.
R**L
Simple to Install & Gives Peace of Mind
This smoke alarm was quick and easy to install, and it provides exactly what I was looking for-reliable protection and peace of mind. The instructions were clear, and it was up and running in just a few minutes. The alarm has a clean, low-profile design that blends in nicely with the ceiling. I also like that it's battery operated, so it continues working even if the power goes out. The test button is easy to access, and the alarm is loud enough to be heard throughout the house, which is exactly what you want in an emergency. If you're replacing an old smoke detector or adding extra protection to your home, this is a dependable, easy-to-install option from a trusted brand. Highly recommend!
W**S
Reliable product, dependable technology with few false alarms. Easy to install.
Ordered as replacements for a rental property. Arrived as expected based off of the add, installed with the included hardware, the detector fit into the bracket easily. Based on previous version of the detector these have a high level of reliability and with new technology, false alarms from cooking are a thing of the past. The alarm produces a loud alarm that will alert anyone in the house of smoke. Have used this brand and versions of this alarm for years in rental property with no problems and few false alarms. Would order again.
E**N
Quick installation. Easy, and works as advertised.
A quick install. I was prepared to drill a new hole or two, but I found two from previous installations that lined up perfectly. The design of the frame that holds the working part allows for quite a few options for hole spacing. If you are replacing an old one in the same location, you may also find you don't need to get out a 3/16" drill bit. It will fit as is. Battery is supplied. I have spares. I tested it with matches. Works perfectly. An additional plus is that it is Made In Mexico, which I consider a plus, because I don't want China getting any more of my business than I have to give them. As you can see, what I got does not look like the image of what I ordered. Same model number however.
D**E
Works. After you replace included dead battery
Has mounting screws and anchors. Plastic feels a bit flimsy but once it's in place it should be fine. Other models I've bought are definitely much sturdier. Should be easy to change the battery, frame stays on wall and you rotate main part of alarm to install/remove. I am disappointed that the included Great Power battery only lasted 3 days. I've had them in other products and they are OK for months. These may be old stock with old batteries.
C**K
smoke alarm
This smoke alarm was just what I needed. It work's great in my RV, fit's perfect, very easy to install, the alarm was load so people can hear it. Price was good for this product
H**B
Replace the alarm battery, not the unit
Battery is easily replaced. Size of the unit easily covers any pre-existing unit as if it is an original install.
K**H
Easy smoke alarm option
I am selling my house and from my home inspection the only thing I legally had to replace was all 4 of my smoke alarms. 1 is hard wired and the other 3 are battery operated. I bought a hard wired to replace my existing, and then 3 battery operated and they were the same size as my previous ones so I was able to reuse the holes and mount these up. Super easy inexpensive option. Just remember to have at least 1 fire alarm thatโs also a for carbon dioxide or to buy separate plug-in carbon dioxide alarms because these are only for smoke.
N**D
One out of six defective
Ordered two 3 packs. One would not stop beeping, defective.
Trustpilot
1 week ago
2 months ago