General items: New materials technology promotion service; Research and development of electronic special materials; Service, technology development, technology consultation, technology exchange, technology transfer and technology promotion; Internet sales (except for sales of goods that need permission); E-cigarette atomizer (non-tobacco products, excluding tobacco ingredients) sales; Retail of computer software and hardware and auxiliary equipment; Electronic product sales; Retail of photographic equipment and telescopes; Sales of household appliances; Sales of smart consumer devices in the home (except for items that must be approved according to law, business activities can be independently carried out according to law with business license); Permitted items: Import and export of goods or technologies (the above business scope involves the registration of customs declaration units) (for items that must be approved according to law, business activities can only be carried out after the approval of relevant departments, and the specific business items are subject to the approval of relevant departments, documents or permits).