Google Nest Temperature Sensor White New Works with compatible Nest thermostats The sensor tells the thermostat what the temperature is in the room where it?s placed and the thermostat uses that reading to control when the system turns on or off to keep that room the temperature you like. Up to 50 feet range. Allows easy placement. Put different temperature sensors in different rooms, like the baby?s room or living room Control your Nest sensor in the Nest app Runs on batteries so it works in most homes; batteries can last up to 2 years Add up to 6 sensors for each compatible Nest thermostat in your home Connectivity : Wireless, Bluetooth Low Energy connection. All measurements are taken on a flat surface are approximate. Please see all photos as they are a part of this item's description.