✽【NOTES】Aqara Hub is required and sold separately. Requires a secured 2. 4 gigahertz Wi-Fi network connection. One Aqara Hub can connect up to 32 Aqara devices. 【UNAUTHORIZED ENTRY DETECTION】Whenever the door/window opens unexpectedly, the Aqara Door and Window Sensor will send an alert notification to your phone and activate the local alarm on the Aqara Hub. 【HOME AUTOMATION】The Aqara Door and Window Sensor can control other Aqara connected devices as the status of the door or window changes. 【22MM WIDE GAP ALLOWED】The Aqara Door and Window Sensor works with most types of doors, windows, and other fixtures with similar mechanism, such as drawers, cabinets, and more. 【VOICE CONTROL】Compatible with Apple Home Kit, Alexa for a hands-free experience. In addition, Aqara offers 12-months after-sales service. If you have any questions with the door sensor, please feel free to contact us. Zigbee2MQTT and comparable third-party USB dongles are not officially supported by Aqara. Full product functionality may be limited or unavailable., Weight: 0.10251495183 Pounds, Manufacturer: Aqara