Backup batteries need to be replaced annually.īelow are the best smoke and carbon monoxide detectors from our tests, arranged in alphabetical order, with hardwired and battery-powered picks for each type of detector: stand-alone smoke detectors, stand-alone CO detectors, combination smoke-CO detectors, and smart smoke-CO detectors that can send alerts to your smartphone. Both hardwired and plug-in detectors use a backup battery that will take over in the event of a power outage.
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