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Google Nest Protect Smart Smoke and Carbon Monoxide Detector Alarm 3-Pack (Battery)

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Protect your loved ones and your home - Detects levels of smoke and carbon monoxide within the home and tests itself automatically
Receive clear direction in an emergency - Alarm speaks to you with a human voice and tells you the location and levels of smoke or carbon monoxide when they are present
Send alerts to your smartphone - Provides battery and sensor status notifications so you're always informed and safety history so you can see what happened over the last 10 days

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Google Nest Protect Smoke and Carbon Monoxide Alarm — 2nd Generation (Battery): Nest Protect reliably detects and alerts you to the presence of smoke or carbon monoxide in your home. The alarm speaks to you in a calm, clear, human voice, telling you the location of the danger. It also provides smartphone alerts and battery status updates to help protect your home while you're away.

Protect your loved ones and your home - Detects levels of smoke and carbon monoxide within the home and tests itself automatically
Receive clear direction in an emergency - Alarm speaks to you with a human voice and tells you the location and levels of smoke or carbon monoxide when they are present
Send alerts to your smartphone - Provides battery and sensor status notifications so you're always informed and safety history so you can see what happened over the last 10 days
Get an early warning signal - If a cooking mishap leads to a small amount of smoke Nest Protect will let you know without setting off the full alarm
Stay on top of any situation - Synchronized sensors ensure that when 1 alarm senses danger - every alarm in the house will make you aware of the situation
10-year life span - Nest Protect’s long-lasting sensors keep you safe and sound for up to a decade
Light your path at night - Pathlight illuminates your way in the dark
Sleep safe and sound - nightly promise is a quick green glow when you turn out the lights that says everything’s working well