The Nest Temperature Sensor (2nd gen) is easy to set up in the Google Home app (Google Home app required) Put the Nest Temperature Sensor (2nd gen) in any room, then set the temperature it should reach at a certain time of day. You can put Nest Temperature Sensors in up to six rooms Battery lasts up to three years, so you can put it on a wall, shelf or wherever you want (approximate battery life based on testing) Sleek and simple, the Nest Temperature Sensor (2nd gen) fits right in wherever you place it Requires a compatible, installed Nest thermostat. Nest Learning Thermostat (4th gen) Nest Learning Thermostat (3rd gen) Nest Thermostat E Identify your thermostat at g.co/nest/whichthermostat. Up to 6 Nest Temperature Sensors supported per connected thermostat and up to 18 sensors per home