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Review title: double edged sword
Product review: I purchased a home where the previous owner installed these everywhere. I do like that in the event of a fire that you have a professional style system, like you would have in a school, that all alarms go off and flash at the same time. However, like another reviewer stated, it's a nightmare when it happens for no reason.About a year ago our carbon/smoke detector started to fail and alarmed randomly, especially at night. It was hard to find what unit was going off, which is the worst part of this design. In theory if something is wrong, the unit is supposed to beep frequently, like 2 times a minute. However, when these things malfunction, the beep goes off at random times (could be ten minutes, thirty minutes, five hours apart) and its very hard to locate where it came from since their are several units in the house. The only way to stop them from alarming is by disconnecting them and pulling the battery, which is really dangerous, as you now have no alarm.
