OVERVIEW: The Nest Protect Smoke & Carbon Monoxide Alarm (Battery) is a smart alarm that features Wi-Fi wireless network connectivity and a variety of safety alarms including a photoelectric smoke sensor, a carbon monoxide sensor, a heat sensor, three activity sensors, a humidity sensor, and an ambient light sensor. Once you have the alarm installed, you'll be able to monitor it from anywhere if you have your connected Android or iOS mobile device with you. The Nest Protect will send you a...