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I change the battery when the unit begins to chirp. It is the internal low battery detection system. Depending upon how many times I push the test button, and quality of batteries I purchase, it ranges from less than a year to 18 months.
What is the average number of time annually you test your smoke alarm? I've found faulty units that were only 2 years old.
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"As nightfall does not come at once, neither does oppression. In both instances there is a twilight where everything remains seemingly unchanged. And it is in such twilight that we all must be aware of change in the air - however slight - lest we bec
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