Research and development of electrical equipment and accessories; sales of electrical heating appliances, explosion-proof electric heaters, communication equipment, busbars, conductors, bridge pieces and accessories, high and low voltage cables, high and low temperature cables, steel, copper bars, copper wires, instruments and meters, hardware tools, copper materials, building materials, high-temperature rod heads, thermocouples, electrical board protectors, conductive blocks, ovens, insulating materials, dust bags, and testing equipment; installation, maintenance, testing, operation, and maintenance of power engineering.