Nest T5000SF Temperature Sensor, WhiteMost homes aren't the same temperature in every room. With the Nest Temperature Sensor, you can let your Nest thermostat know which room should be the most comfortable. Just place it on a wall or shelf and get the right temperature, right where you want it. Communicates temperature to compatible Nest thermostats Wireless bluetooth low energy Up to 50 feet away from your Nest thermostat* Color: White One CR2 3V lithium battery (included) Operating