![]() It blinks once every minute to show that the smoke detector is powered and functioning as it should. The green light on a First Alert smoke detector serves as an indicator that the device is working properly. ![]() This can be confusing or even alarming to some homeowners, but it’s actually a normal part of the smoke detector’s operation. If you have a First Alert smoke detector in your home, you may have noticed that the green light on the front of the device blinks periodically.
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