SwitchBot Contact Sensor, a smart home gadget made up of two components that are fixed close to each other on things such as doors and windows, can detect the opening / closing of doors and windows, guarding security of the elderly, children, and pets. With a detection range of up to 16.4 ft (5m), 90¡ã horizontally, and 55¡ã vertically, any movements that your door or window makes can be detected to help notify you when contact takes place. When connected to SwitchBot Hub Mini, SwitchBot Contact Sensor can push notifications to your phone when someone enters your home, when the window is open, or when your pet leaves its cage.