With the Nest Temperature Sensor, you can let your Nest thermostat know which room should be a certain temperature at a certain time of day. And that room will always be the most comfortable. Works with the Nest Thermostat E or the 3rd gen Nest Learning Thermostat. ... Put temperature sensors in different rooms.
The Nest Temperature Sensor is battery powered so you don't need any special wiring or an outlet to use it. It connects to your 3rd gen Nest Learning Thermostat or Nest Thermostat E over Bluetooth Low Energy and has a range of about 50 ft (15 m) so it should work in most homes.
In many ways, the Temperature Sensor catches Nest up to its competitor Ecobee, which has included remote sensors with its smart thermostats for years. It also makes balancing hot and cold areas in your home much easier than using just a single Nest thermostat on the wall.