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We’ve all been there. It’s 2 a.m. and you hear an eardrum-piercing beep. Your first reaction is to cover your head with a pillow and pretend it never happened. Eventually the slow chirping takes ...

Smoke and CO alarms offer an early warning when a fire breaks out or when carbon monoxide levels have reached a dangerous threshold, but if you’re not home when an alarm is triggered, it may be too ...