Can add up to six remote sensors for temps in various rooms/areas. App allows control remotely via home wifi connection. Can select thermostat or remote sensor temp as master to slave to heating/cooling system. Have two. Can control either system remotely from the app. It is awesome.
This is a great upgrade to my old thermostat! I used to have to manually turn on the heat and AC throughout the day because the old thermostat could not switch modes. Now I just set it and forget it. Hot during the day, the AC comes on. Cold at night, the heat comes on. Now no more waking up in the middle of the night turning on the heater. And now with a sensor in the kids room I don't have to worry if they are too hot or cold. At night the sensor in the kids room takes priority and keeps their room at the perfect temperature. I might purchase additional sensors in the future for added control.