The Wall Mount Remote Temperature Sensor replaces the internal temperature sensor within any RCS Wall Display Unit. Add additional sensors to average temperatures in large areas. Add this sensor to allow monitoring of temperatures in locations away from the RCS display unit. Also, if the present location of your thermostat does not accurately sense the home's average temperature, you can place this unit in the optimum location. To get an average temperature from multiple locations simply add up to 4 additional sensors.