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Roost started out with a great battery that makes any dumb smoke alarm smart. We weren’t quite as impressed with their second product, a smoke, fire, carbon monoxide, and natural gas detector that uses that same battery for emergency backup power (the detector itself is designed to be hardwired to power). Now the company is expanding its offerings with a smart water leak detector, and it’s a winner. If the company follows through with its promise to offer an add-on accessory, it will be our top pick in this category.
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