Optimize Temperature with GE Thermostat (Required, Sold Separately): Add sensors to different rooms and create the ideal temperature, reduce drafty or hot spots, and improve temperature consistency throughout your house with our programmable thermostat Temperature and Humidity : an accurate, real-time reading of the temperature and humidity in the room the App, powered by Savant Convenience and Comfort: Whether at home or on the go, use the humidity with our thermostat for home heat and AC with auto mode, set custom schedules, and turn up the heat or cool down your home with the App; No bridge or hub required Voice Control Anytime, Anywhere: Pair this room temperature with our WiFi thermostat to adjust settings via Google Home or Alexa devices (sold separately) with the sound of your voice; 2.4GHz internet connection required for control DIY Installation: The thermostat is 1.6 inches in diameter and easily mounts to walls with the screw or removable tape