LoRa wireless chlorine gas (CL2) sensor is a wireless IoT sensor used for monitoring chlorine gas. Based on LoRa spread spectrum modulation technology, ultra long distance communication between terminals has been achieved. Equipped with high-performance chlorine gas sensors and microprocessors, it has the characteristics of high detection accuracy, stable performance, and low power consumption. It can preset upper and lower threshold values based on the environment and actively report data anomalies. Widely used in industrial safety, industrial parks, environmental protection and other scenarios.