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Review title: Works well
Product review: This unit replaced an Identical unit in the house that was about 6 years old. We change batteries every year with the clock changes in the Fall. The only thing I wish this unit had was a battery door on the front of the unit so that it didn't have to be disconnected and turned over to replace the battery every year. There are 7 other units in the house which all have a battery door on the front making battery changes very easy. These other units are smoke only and don't have Carbon Monoxide detection.
