Google Nest Temperature Sensor – Smart Home Thermostat Sensor (3 Pack) T5001SF

The Nest Temperature Sensor is compatible with the 3rd generation Nest Learning Thermostat and the Nest Thermostat E.1 The sensor tells the thermostat what the temperature is in the room where it’s placed. The thermostat uses that reading to control when the system turns on or off to keep that room the temperature you like.