Overview: The Wireless Indoor Sensor(s) is used to change the sensing location of the thermostat. Sense temperature and humidity remotely, average temperature, and humidify and dehumidify in separate locations.Features:The Wireless Indoor Sensor(s) is used to change the sensing location of the thermostat. Works with RedLINK 2.0 thermostats. Sense temperature and humidity remotely. Average temperature Control temperature and humidity in separate locations. Humidify and dehumidify in separate locations. For example, humidify on the main level and dehumidify in the crawl space. Up to 6 Wireless Indoor Sensors per thermostat.Includes: 2 AAA alkaline batteries and mounting hardware