Attenrion: Works with Nest thermostats 3rd Gen and Nest thermoste E. 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.Compatible with select Nest thermostats. Including Nest Learning Thermostat, 3rd Gen and Nest Thermostat E.Wireless. Bluetooth Low Energy connection.Long battery life - Works on CR2 3V lithium battery (included) with up to 2-year lifetime.Up to 50 feet range. Allows easy placement..Product note: You can also check your system's compatibility before purchasing a Nest thermostat with our online Nest Compatibility Checker Put different temperature sensors in different rooms, like the baby's room or living room Control your Nest sensor in the Nest app; set a schedule and choose which room to prioritize when [2] Compatible with select Nest thermostats. Including Nest Learning Thermostat, 3rd Gen and Nest Thermostat E. The Nest Temperature Sensor is easy to set up; just hang it on the wall or place it on a shelf