General business items: R&D, purchase and sale of fiber optic transceivers, video optical transceivers, fiber optic switches, protocol converters, fiber optic routers and communication equipment; domestic trade; import and export of goods and technology. (Except for projects prohibited by the above laws and administrative regulations; projects restricted by laws and administrative regulations must obtain a license before they can be operated); information consulting services (excluding licensed information consulting services); information technology consulting services. Technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; sales of household appliances; sales of mechanical and electrical equipment; sales of distribution switch control equipment; sales of building materials; sales of automotive decorative supplies; sales of industrial automatic control system devices; sales of metal structures; sales of building decoration materials; sales of electronic products; sales of communication equipment; sales of optical communication equipment; sales of power and electricity Sales of sub-components; sales of optical instruments; manufacturing of optical instruments; retail of daily household appliances; sales of household appliance spare parts; sales of audio equipment; sales of household audio-visual equipment; wholesale of computer software, hardware and auxiliary equipment; retail of computer software, hardware and auxiliary equipment; sales of satellite mobile communication terminals; sales of photovoltaic equipment and components; sales of refrigeration and air-conditioning equipment; and manufacturing of computer software, hardware and peripheral equipment. Licensed business projects: production of fiber optic transceivers, video optical transceivers, fiber optic switches, protocol converters, fiber optic routers and communication equipment.