Dual-card industrial 4G routers are usually used in projects with high speed requirements. If the signal of card 1 is not strong or the traffic is exhausted, card 2 can be automatically activated. If low-cost projects require power consumption and traffic, it is not suitable to consider dual-card industrial 4G routers.The main feature of the dual-card industrial router is the dual-card dual mode, which enables different operators to be online at the same time, and can switch between wired and wireless at any time. Intelligent switching of multi-network mode is carried out to ensure the backup of communication link switching, so as to prevent disconnection and ensure that the entire project will not be interrupted.Dual card industrial 4G router intelligent environmental protection applicationEnvironmental monitoring is usually in an outdoor environment, which is suitable for wireless monitoring purposes. An environmental protection detection system can be formed on the detection platform by transmitting the status data of each emission pollution source. The environmental detection system can carry out automatic sampling of pollution sources, online monitoring of pollution factors and other data, so as to grasp the total amount of urban pollution emissions.The dual-card industrial 4G router realizes outdoor networking in this environmental protection detection system, and transmits the pollution source data of the discharge place through WIFI wireless, and the VPN/VPDN virtual private network is used for security protection during transmission. If the signal of one of the 4G cards is too weak or there is no signal in a place with a wide distribution, a large number, a long distance or a remote location, the card 2 can be switched automatically, and data loss will not be caused by no signal.