Seeed Technology Co., Ltd Door, Window Sensor with LoRaWAN Output. This specialized sensor, part number 101990921, is designed for robust environmental monitoring applications. It accurately detects the open or closed state of doors and windows, transmitting this information via the LoRaWAN protocol. Ideal for smart building management, industrial automation, and security systems, this component offers reliable long-range, low-power wireless connectivity. Its bulk packaging ensures efficient deployment for large-scale projects.