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Title: Stopped working after 2 years
Review: Had the same experience as many of the other reviews here. Bought the 3 pack from Costco. During my 2nd year of ownership, I performed my annual change of batteries and found that 2 of the 3 units were not functioning. I'm concerned that I have been living in a house with non-functioning units and thank God I was not in a situation where I needed the smoke alarm to alert me. This is dangerous and unacceptable, as the life expectancy of this product should be longer. Simple - Do not buy this product!
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