Google Nest Temperature Sensor T5000SF – Smart Remote Sensor for Nest Thermostats, Easy Setup, Room-by-Room Comfort, Wall or Shelf Mount, Works with Nest Thermostat E & 3rd Gen, Bulk Packaging

Room-by-Room Comfort – Enables individual temperature control in any room for a personalized climate experience.
Easy to Install – Mounts on the wall or sits on a shelf; wire-free setup via Bluetooth Low Energy.
Long Battery Life – Uses a replaceable CR2 battery that lasts up to 2 years for maintenance-free use
Works with Nest Thermostats – Compatible with Nest Thermostat E and Nest Learning Thermostat (3rd Gen).
Whole-Home Temperature Control – Add up to 6 sensors per compatible thermostat to manage comfort throughout the home.