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Review title: programed to fail after 7 years
Product review: works well but no warning that between 7-8 years they will ALL fail. no warning of this ahead of time just recommendation to replace at 7 years. no warning that they will all fail. my home is large and has 45 detectors. what a surprise to find them all failing within 8 years of manufacture--NOT installation. check the dates (stamped on back of unit). if not current remember it will fail early
