General project: communication equipment sales; Sales of electronic products; Mechanical equipment sales: instrument sales; Wholesale of electronic components; Photovoltaic equipment and components sales; Display device sales: pneumatic power machinery and components sales; Optical cable sales; Optical communication equipment sales; Sales of capacitors and their supporting equipment; Electronic special equipment sales: battery sales; Computer equipment sales; Household electrical appliance repair; Computer hardware, software and auxiliary equipment retail: information system integration services: refrigeration, air conditioning equipment sales; Outdoor products sales; Refrigeration and air conditioning equipment manufacturing; General mechanical equipment installation services; Electronic and mechanical equipment maintenance (excluding special equipment): intelligent transmission and distribution and control equipment sales: pump and vacuum equipment sales; Sales of instruments for supply; Sales of generators and generator sets; Container sales; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology popularization; Import and export of goods; Technology import and export. (Except for the items subject to approval according to law, independently carry out business activities according to law with the business license)