The best smoke-alarm systems are connected to your house’s wiring and have a battery backup. A standalone, battery-powered alarm is better than nothing at all, but a wired/battery system is preferred. Check the house for smoke detectors and then check the detectors themselves. Press the test button on each smoke detector. If you don’t hear the annoying screech designed to just about wake the dead, you have a dead battery, a dead circuit, or a dead detector.
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