First Alert BRK SM210, 10-Year Sealed Battery Smoke Alarm with Slim Profile Design, 1-Pack

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I needed to replace one wired and one battery smoke alarm. The original First Alert unit was no longer available, so we opted for the recommended unit. It arrived in a plain cardboard box, but the device was sealed. We had to change the mounting bracket to adapt to the newer design, but the size and function remained the same. All in all, a good quality alarm that will hopefully last the same 10 years as the original.

Well made and sturdy. Like the instructions on outer cover for use. Tested and works. Would recommend. Best one for a senior; don’t have to be changing batteries all the time.

Easy to install. These are sensitive, and will detect the slightest danger of smoke. I am impressed with the quality, and how well it works! 10 year sealed battery, and it's durable.

It was easy to install and activate. Shipping was fast as well.

I'm disappointed in this model of smoke detector. My brother is a firefighter and insisted I get a smoke detector for every floor of my home, and said that if I bought one with a sealed battery I would be able to set it and forget it for about 10 years. I begrudgingly spent money that had been gifted to me on these for safety rather than something fun, and I at least felt secure. Until the upstairs unit started firing off at nighttime. This must have happened 5 or 6 times, jolting me from sleep in a panic, before I disabled the unit. My brother said I should use canned air to spray through it in case something was setting it off but that didn't help. Now, less than a year after the purchase of these 3 units, I've got my basement one giving a low battery chirp every 30 seconds or so. This was supposed to last for *years*. So far the only one that hasn't shown some sign of being defective is on the ground floor, so I didn't bottom out all my star ratings but 2 out of 3 is a pretty horrible rate of defects. Update 10 June 2020: I was just woken at 6:15am to the upstairs alarm misfiring just like the first faulty one did. It looks like I'll have to replace this one too. The good news is these units are loud as hell. The bad news is whatever they don't like about my home seems to be a common issue and not a simple bug with only one of the three I originally bought. It's really disconcerting to wake up and rush through your house looking for the source of a fire you expect to end life as you know it only to realize it's just another defective smoke detector. Dropping my review to one star. 3 out of 3 units malfunctioning is a real drag, especially given that the product description brags of how its unique design cuts down on false alarms. I've filled the house with smoke cooking and the device never made a peep, but we get all 85 decibels at random while trying to sleep.