Ecobee Smart Thermostat Premium optimizes comfort while saving energy through superior intelligence and technology. It has a built-in air quality monitor, doorbell Live View, smoke alarm detection, and geofencing technology to understand occupancy. Included SmartSensor eliminates hot and cold spots and adjusts the temperature in the rooms that matter most. Works with Siri*, Alexa, Google Assistant, HomeKit, and SmartThings. *Apple home hub required to enable Siri.