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I have used a couple of CO detectors in the past and this one is pretty solid. It’s relatively small but does pack a whopping noise. The one I have before constantly needs battery changing every 3-4 months or so. It’s a battery hog, so let’s hope this one isn’t.
About a week after it was installed, it sounded a brief warning alarm. I discovered an open, unlit stove burner, shut it off, and opened some windows. The alarm stopped right away.
My son and grandson recently experienced carbon monoxide poisoning, fortunately during daytime when they were awake and able to be aware of symptoms. After a blood test in the emergency room they were treated with hyperbaric oxygen to prevent permanent effects. After hearing about this I ordered the P918 detector alarm. When I received it I was so impressed with the instructions and ease of testing and use that I ordered two more for another bedroom and for a friend.