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Review title: Malfunctioned after 1 year
Product review: So after a year it started to chirp. The instructions state that this means the battery is weak. Additionally you're supposed to use compressed air to blow or a vacuum to suck out dust, as I know that moisture captured in dust particles can cause malfunction. So I cleaned it & changed the battery. It was fine for a few days then it started to chirp again. I used the vacuum again. Then one day later "chirp." By this time I had had enough since it would especially wait until I was fast asleep before it would start chirping. I tested the battery with a multimeter. Both the new one and the old one were good. I bought a new battery for nothing. I never had the opportunity to test it in real smoke, but I never will since I got rid of it.
