5 Year warranty. Not available at retail. Hard wired Nest Protect. Lights up and speaks with a human voice when it senses smoke or increasing Carbon Monoxide Levels. If multiple detectors are in the home it tells you where smoke ior CO s. This gives you an earlier warning if there’s an emergency, or allows you to silence Nest Protect if it’s just a nuisance alarm. The Nest Protect app send you a notice whenthe alarm is activated. The Nest Protect app send a notice to your phone when the alarm is activated or the batteries are running low. The light activates when it senses motion acting as a pathway nightlight.

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