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Review title: After 3 months low battery alarm won't stop - even with brand new batteries
Product review: I purchased this to replace an identical model that was beeping with a low battery alarm (and would not stop even after replacing with brand-new alkaline and expensive lithium batteries). The new unit worked for about three months until it started beeping as well. Changing the battery with multiple alternate batteries did not resolve - again lithium or alkaline. For both detectors I tested them hard wired and also without and it didn't make a difference. I'm giving the lowest rating because the first unit was purchased at a local store, and the second unit from Amazon so the chances they're from the same potentially bad "batch" is very low. No-one can tolerate the obnoxious and continuous low-battery alarm beep so the unit is effectively junk.I replaced it with a First Alert unit that's working fine.
