R&D, manufacturing, maintenance and sales: complete sets of high and low voltage electrical appliances, distribution switch control equipment, high and low voltage electrical appliances and accessories, circuit breakers and accessories, electronic components, box-type substations, transformers, high and low voltage switch cabinets, lightning arresters, ring network cabinets, cable branch boxes, inflatable cabinets, bus ducts, metal bridges, instruments and meters (excluding measuring instruments), hardware products, mechanical equipment, electromechanical equipment, power transmission and transformation Equipment, auto parts, wind energy equipment, electric energy equipment, solar energy equipment; sales: chemical raw materials (excluding hazardous chemicals), construction materials (excluding hazardous chemicals), fuel oil (excluding hazardous chemicals), lubricants, lamps, office supplies, non-ferrous metals, pressure vessels, industrial control equipment, motorcycle accessories, wires and cables; power engineering construction; import and export of goods and technology.