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With the Google Nest Protect V2 Battery (3 Units), you'll be aware of any possible smoke development or carbon monoxide leaks in your home anywhere, anytime. As soon as the smoke and carbon monoxide detector is mounted to your ceiling, you can control it using the Nest app on your smartphone, tablet, or smartwatch. Whenever the detector detects smoke or carbon monoxide, it signals you by means of a female voice of 70 decibels. This voice tells you exactly where in the house the danger is. The app also keeps you up to date with respect to low battery status or sensor outages. Use WiFi to connect the Google Nest Protect V2 to other Google Nest products, like the Google Nest thermostat and the Google Nest IP camera. This way, you get more benefits from the separate products. A green light will switch on as soon as the motion sensor detects movement in the dark. 1 Google Nest Protect V2 (battery) runs on 6 AA batteries that are included by default.