General items: Sales of electronic products; Electronic and mechanical equipment maintenance (excluding special equipment); Computer and office equipment maintenance; Retail of computer hardware, software and auxiliary equipment; Battery sales; Battery parts sales; Information system operation and maintenance services; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology dissemination; Communication equipment sales; Information system integration services; Retail of photographic equipment and telescopes; Sales of household appliances; Daily necessities sales; Home audio-visual equipment sales; Stationery retail; Office supplies sales; Software development; Import and export of goods; Technology import and export; Import and export agents (except for items subject to approval according to law, independently carry out business activities according to law with business licenses).