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A good smoke alarm should have a power source from a battery so it is sure to go off in the event of a power failure. Be sure to test your smoke alarms regularly to ensure the batteries are in good working order.

Hearing a high pitched "beep" throughout the house? Check your smoke alarm! This annoying sound is their way of telling you to change the batteries or that something is wrong with it.

user comment: that doesn't really answer "why?" it goes off.

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13y ago
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13y ago

You don't want to rely on a smoke detector that doesn't have power. This is why some detectors have an internal battery that can alert you to a possible dangerous situation.

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Q: Why do smoke alarms go off in a power outage?
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