A door sensor checks whether your door—e.g., your front door or patio door—is open or closed. This is important if you want to strengthen your home security or optimize your heating.
Since the door sensor is radio (Zigbee) is connected to your smart home hub, other smart home devices can receive information from the door sensor: If the door sensor in the living room reports "door open," the smart radiator thermostat in the living room reacts automatically and turns down the heating. If the door sensor in the hallway reports "door open" even though you are out with your family, the activated alarm siren immediately reacts with a shrill warning tone. You also receive the door sensor's messages as a message on your smartphone. This gives you full control over your smart home.
