Customer Reviews

First Alert SA4121B Smoke Alarm

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This piece of junk is one of the few detectors that meets Illinois residential building code (curious the company is Illinois based). Illinois requires battery and 120v power plus interconnects. However, these things will not stop chirping. Even after removing the batteries and unplugging them, they chirp for several minutes (must be an internal capacitor). The battery replacement compartment does not hold the batteries. These should REALLY be recalled. I can't believe something this bad could have made it to market. I will never by another First Alert product after experiencing this piece of trash. The silence feature is really dumb. When you press the silence button, it chirps for fifteen minutes to tell you that it is in silence mode. (How is this silent?) The only way to stop it from chirping is to remove the batteries, pull it off the wall to remove 120v power. Then you need to smash it to pieces to break the circuit board.

I inherited one of these when I bought my house and I hate it. The stupid thing "chirps" randomly all the time. The chirp is supposed to tell you that your battery backup is running low, but I've replaced the battery twice in less than a year and the stupid thing keeps chirping. Don't waste your money on this smoke alarm; it may detect smoke, but it will try to chirp you to death in the process.

I agree with another reviewer. I have had one for several years and chirps now constantly new battery does not help.