Bundle includes ecobee SmartThermostat Premium, SmartSensor, and a 2-pack SmartSensor for Doors and Windows that, together, can serve as a complete home security system with your thermostat as the hub. SmartThermostat Premium has a built-in air quality monitor that alerts you to poor air quality, provides tips on how to improve it, and reminds you when it’s time to change your furnace’s air filter. SmartThermostat Premium can detect the sound of a smoke alarm and send an instant notification to your smartphone.* SmartSensor alerts you the moment its wide 120° motion sensor catches activity inside your home up to 16 feet away. ecobee uses Wi-Fi and geofencing technology to understand when your home is empty or occupied and will automatically arm or disarm your system.* SmartSensor for Doors and Windows alerts you when a door or window has been left open for more than 5 minutes and works with your thermostat to turn off your HVAC to save energy.* ecobee Smart Security uses advanced sensor technology to alert you to possible break-ins or fire. Control your comfort and security right from your thermostat, and keep your whole home connected. 24/7 professional monitoring available for only $10/mo. Try the subscription free for 2 months - no contracts, no commitments. * Requires ecobee Smart Security subscription plan.