Production, installation, leasing and sales of internal combustion engines, generators and generator sets, mechanical equipment, gas generators, thermal insulation materials, sound insulation materials, water pumps and vacuum equipment (branch branches only); sales of mechanical equipment and accessories, electrical equipment, wires and cables, Wujinjiaodian, electronic products, high and low voltage switches, high voltage vacuum circuit breakers, high voltage load switches, LED lighting products; design and construction of lighting projects and landscape lighting projects; construction of computer room noise reduction projects and environmental protection projects.