Manufacturing and sales of special industrial motor vehicles for use within factories (sites) and special tourist sightseeing vehicles for use within factories (sites); sales of automobiles; sales and after-sales service of ambulances; sales and after-sales service of medical special vehicles and equipment; research, development, manufacturing, sales, and after-sales service of Class I, II, and III medical devices; sales and technical services of self-developed mobile police station series products, police equipment products, filming equipment and supplies, wireless audio and video transmission products, electronic products, security products, civil unmanned aerial vehicle systems and equipment; technical research, development, production, and sales of computer software and hardware; computer system integration; sales of testing equipment and communication equipment; technical research, development, sales, maintenance, processing, and installation of fire-fighting equipment and devices; import or export of goods and technologies.