AN-108B LoRaWAN manhole cover alarm is a low-power wireless manhole cover safety monitoring product used for real-time monitoring of the status of manhole covers. When the manhole cover moves or opens abnormally, the alarm immediately reports the alarm information to the business platform through the LoRaWAN wireless network. The manhole cover alarm is based on LoRa spread spectrum communication technology, supports standard LoRaWAN protocol, and has the characteristics of long-distance low power consumption, which can quickly integrate with third-party platforms. Equipped with a large capacity battery, the device has a working life of over 3 years. The alarm can be used in harsh manhole environments. The product is easy to install and maintain, and can be directly fixed and installed on the inside of manhole covers made of materials such as cement, cast iron, resin, etc. Widely used in the management of manhole covers for municipal sewage, communication cables, gas, heat, electricity, water, and other purposes.