The MANET3902 is specially designed for rapid deployment on the scene of public security, armed police, army, civil air defense, emergency response office, government public security and other departments. It adopts durable IP67 military standard suits various harsh conditions such as outdoor erection and vehicle carrying. The whole device is made of cast aluminum body, which is good for heat dissipation and can adapt to almost 100% working environment The portable design is suitable for vehicle or backpack use. It can be used with MAENT3901 narrowband portable base station, and can also be used independently. The unique relay function design can achieve the purpose of hierarchical networking, hierarchical command, and extending communication distance.