Battery, battery packs, development of mechanical and electronic equipment technology, technology transfer, manufacturing, and sales; technical development of distribution panels; cabinet and enclosure processing, manufacturing, and research and development; wholesale and retail of electrical equipment, hardware, crafts, high and low voltage transmission and distribution equipment, electrical components, automation control devices for instruments and meters, mechanical and electrical equipment, chemical raw materials (excluding hazardous chemicals), and communication equipment; exhibition and display services; installation and sales of anti-theft doors, stainless steel windows and doors, and plastic steel windows and doors.