Aqara Door and Window Sensor

Aqara Door and Window Sensor. The Door and Window Sensor P2 uses a magnet to identify if a window or door is opened or closed, a feature that can be useful in any number of smart home automations. For example, they can be used to enhance security, remind you to close a window when it starts to rain, or alert you that a freezer door has been left open too long. The Door and Window Sensor P2 comes with an adhesive mount “that will not damage the wall if removed,” says Aqara, and a thin magnetic plate for additional mounting options.