The Aqara Door and Window Sensor is a wireless device that can detect the opening and closing of doors, windows, and other types of doors. It consists of a sensor unit that is attached to the door or window frame, and a magnet that is attached to the door or window itself. When the magnet is close to the sensor, the sensor sends a signal indicating that the door or window is closed. When the magnet moves away from the sensor, the sensor sends a signal indicating that the door or window has been opened.
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