Battery Smoke Alarm | SMI100

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!

My wife wanted these to replace the ones in her mom’s house. I installed them and they were easy to install and they came with batteries and were easy to test. The alarms are well made with strong materials. They are light and the sensitivity is good. Great replacement product. Worth the money

Great working smoke detectors at a great price. Very easy to install. They include the mounting plate but mine just so happened to be the same size.

Safety first. These alarms are neat and compact, visually appealing and priced right. Easy to install on wall or ceiling. So far they don’t seem too sensitive.

Easy to install and I love that it takes AA batteries. I will say it’s a bit too sensitive. Too much steam from the hair dryer will set it off. But, better safe than sorry, I guess.

If you are looking to replace an outdated or constantly chirping detector with a reliable, standalone safety device, the First Alert SMI100 Battery-Operated Smoke Alarm is an outstanding upgrade. The defining feature of this model is First Alert's Precision Detection advanced sensing technology, which is specifically engineered to meet strict modern UL 217 industry standards. This smart ionization framework is highly sophisticated—it can distinguish between real, high-velocity fire emergencies and common, non-threatening cooking smoke or shower steam. This means you can mount it near kitchens or hallways without dealing with annoying false alarms every time you sear a steak or open a hot oven. Maintenance on this unit is exceptionally user-friendly. It features a front-loading battery compartment, which means you can swap out the backup battery in seconds without having to twist the entire detector off its ceiling bracket. It includes a multi-purpose Test & Silence button that lets you check the electronic circuits with a single tap, or temporarily mute a nuisance alarm for up to 8 hours. When the unit finally approaches the end of its operational lifecycle, an automated end-of-life chirping warning lets you know exactly when it is time to swap out the physical detector, ensuring your living space stays continuously protected.

These were easy to install and tested successfully. They don’t interconnect, so if that is important, you will need to spend more. These were a very low cost option.

Easy to install, very sensitive, standard size, and it works.