The Aqara Door and Window Sensor is a smart home device designed to detect the opening and closing of doors and windows. It is compatible with various smart home systems, including Apple HomeKit, Alexa, Google Assistant, and Mi Home.

The sensor is made up of two components: a small magnet and a main sensor unit. The magnet is attached to the door or window frame, while the sensor unit is attached to the door or window itself. When the door or window is opened, the magnet moves away from the sensor, triggering the sensor to send a signal to the smart home system.

The Aqara Door and Window Sensor is wireless and uses Zigbee technology, which provides a reliable and stable connection with low power consumption. The battery life of the device is around 2 years, depending on usage.

The Aqara Door and Window Sensor can be used in various ways to enhance home security and automation. For example, it can be used to trigger alarms or notifications when a door or window is opened unexpectedly, or to automate lights or heating systems based on whether a door or window is open or closed