NVR-B100 adopts 19-inch 2U standard chassis design, full metal shell, good electromagnetic compatibility, and can fully adapt to the use environment on the train. The host consists of a chassis and functional unit boards. The functional boards include power boards, switch boards, AI boards, NVR boards, and hard disk modules. The product has the characteristics of simple structure, modular functions, easy operation and maintenance, and is mainly used for on-board video monitoring and storage in the rail transit industry.