Manufacturing, processing, and sales of high-voltage equipment, power transmission and distribution equipment, and hardware electrical accessories; cold-formed sheet metal processing; self-operated and agency import and export of various goods and technologies (excluding goods and technologies restricted or prohibited by the state); design, research and development, after-sales service, and related information consulting for high-voltage equipment; sales of special vehicles; software development. Manufacturing of marine auxiliary equipment; manufacturing of electrical equipment; manufacturing of mechanical and electrical equipment. General items: repair of electrical equipment.