M51H-A1 is a highly expandable product developed for vehicle-mounted video surveillance and remote video surveillance. It is equipped with an active safety driving assistance system. It adopts a hard disk self-ejecting structure design and an embedded operating system, integrating IT cutting-edge technologies such as H.264/H.265 video compression/decompression, 3G/4G network, WIFI, GPS/BD positioning, etc. It has the characteristics of strong earthquake resistance, simple appearance, flexible and convenient installation, comprehensive functions, and high reliability. It is suitable for mobile vehicle monitoring fields such as public security police, financial escort, long-distance passenger transport, and road administration inspection.