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However, if they go off while you're not there, how will you know if something's amiss?Smart smoke detectors, such as the Nest Protect, will send you an alert to your smartphone in the event of an emergency. But there are other reasons why this $100 device is our top pick. DesignNest's smoke detector is a bit larger than your standard model, measuring 5. 3 x 5. 3 x 1. 5 inches.