Computer information system integration services; development and sales of computer software and hardware; manufacturing, sales, and installation services of shielding products; design, sales, manufacturing, and installation services of mechanical equipment, computer equipment and peripherals, security equipment, paper and optical/magnetic media destruction equipment, power distribution cabinets, and network cabinets; design, construction, and services of computer rooms and vehicle communication systems; computer information security technical services; digital archiving processing; property management services; operation of telecommunications services; construction of building intelligent systems; electronic and intelligent engineering, installation of mechanical and electrical equipment; domestic labor dispatch (valid until March 14, 2025); human resources services; sales of automobiles; import and export of various goods and technologies, except those restricted or prohibited by the state.