The QTC405 wireless intelligent digital pressure gauge is installed on the indoor fire hydrant water inlet pipe tee. It is a device for real-time monitoring of water pressure in the municipal fire pipe network or water pressure, temperature, power data collection and other information. Through the narrowband Internet of Things (NB-IoT) wireless remote transmission method, the monitoring data is automatically uploaded to the management platform. Through the management platform, the global pipe network can be centrally managed, and the real-time monitoring data of the pipe network can be consulted at any time; the pipe network alarm points that have alarms or failures can be accurately and quickly positioned and navigated, and the mobile phone APP can facilitate the staff to conduct pipe network inspections and rapid dispatch Single maintenance processing, etc., so as to realize the true "smart fire protection". The product can be applied to the installation of the new intelligent indoor fire hydrant pipe network and the renovation project of the old pipe network.