Design, production, sales, installation, and after-sales service of optical components, lenses, projectors, cameras, application servers, large screens, various optoelectronic display equipment, radar, perimeter protection equipment, optoelectronic instruments, photovoltaic modules and systems, electronic products, power equipment, Class II and III electromechanical equipment, storage equipment, infrared thermal imagers and related products and parts; metrology and testing; electronic and intelligent engineering; software development and sales; production and sales of chemical products (excluding hazardous chemicals, precursor chemicals, flammable and explosive items), aluminum-plastic and non-metallic pipes (excluding hazardous chemicals); sales of elevators and special vehicles; metal surface treatment and thermal processing, metal processing machinery manufacturing, non-metallic surface treatment and processing; technical research and development and sales of Class I, Class II, and Class III medical devices; technical development and technical services for target equipment; sales of automatic target reporting equipment; computer information system integration services, security technology prevention engineering design, construction, and maintenance (Level II); import and export of goods and technology (excluding those prohibited or subject to administrative approval by the state).