smoke detector
Photo: Courtesy of walmart.com
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Battery-Powered Smoke Detector

Supplement hard-wired smoke detectors (if you have them) with at least one battery-powered model per floor, especially in the kitchen and near bedrooms. Go with a model with a sealed-in, 10-year lithium battery to spare you frequent battery replacement.

Kidde Long-Life sealed battery smoke alarm, $20; walmart.com
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