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Review title: Not Reliable - Junk
Product review: I have other First Alert hard wired smoke detectors in home. All work fine. I purchased this one with the carbon monoxide detector. First the battery compartment is almost impossible to know if battery is set in correctly. I had to take the whole unit apart. But before taking apart the unit just plain broke after a few months. Unit kept beeping. Changed battery. Changed battery again. Beep. Beep. Beep. Poorly designed. This is now an expensive toss away. Opening the battery compartment is not intuitive. Stay away from this one.
