Door sensors detect door position (i.e., open or closed) based on the precise gap between the magnet and the reed switch.

The latest door and window sensor developed by Aqara is the company's first to be compatible with the Matter network standard out of the box and seamlessly integrates with HomeKit to enhance home ...

$199.99Base kit includes hub, 3 door/window sensors, keypad and a motion sensor. Requires three-year professional monitoring contract. Professional monitoring monthly cost $24.99 and upSystems with ...