I bought 7 of these as replacements for an older model that Kiddie no longer makes. Within 3 months of installation, I have had 3 false alarms (twice in the middle of the night). The false alarms came from 3 different rooms, so I have 3 defective units out of the 7 I installed.Our home is very clean, we do not smoke, and the units that failed were in bedrooms (not the garage or kitchen). So, I can not see any reason for the false alarms.I would not recommend this model, they are not reliable.

I had a house full of Kidde 1275 smoke alarms, and after several malfunctions (including one electrical problem causing it to literally "go up in smoke"), I replaced them with the i12040 ... only because I wanted something that would "drop in" with the current mounting system and wiring. That they did, and I've had no false alarms in the month they've been installed.Why the 2 stars? Previous to purchasing, I contacted Kidde (via their customer service web page) to ensure the i12040 units had the same mounting system as the old 1275's and to ensure the wiring would be compatible with all the Kidde alarms on the system. Kidde never responded. I found out from a do-it-yourself web forum that these would work fine.Kidde's customer support is notoriously poor. The old 1275 units were deficient in design and/or manufacture - and Kidde refused to acknowledge this. I won't give high marks to a company that won't respond to customer service issues.

Replaced the older model as everyone else and was happy with how easy it was. Then, the false alarms started coming about a month later. Going to try to switch to a different brand and hope I can use existing wiring some how.

This is the second unit of these that I have replaced for false alarms. Humidity seems to set them off when I called the company they said " Oh yeah, that will happen take it down and take out the battery till the humidity passes". I don't like taking down my smoke alarms especialy in the middle of the night when these false alarms occure most of the time leaving my family and home unprotected. I am looking for another manufacturer.

I purchased three of these for a basement addition. They would not work with my older Kidde detectors and the customer support did not respond to several inquiries. I purchased another brand and replaced every detector in my house. I cannot recommend Kidde products because of this lack of support.

It is astounding that given everything that is possible in this day and age, what complete crap this product is. I had the unfortunate circumstance of purchasing a house where the builder had installed 15 of these smoke alarms. The sheer number of false alarms generated by these silly things has done nothing but train my family to effectively ignore any smoke detector warnings. It is amazing this company hasn't been sued into bankruptcy by now.