Shanghai Shenyi Mechanical and Electrical Equipment Installation Co., Ltd. mainly engages in the maintenance and installation of mechanical and electrical equipment, communication equipment, water and electricity installation, paint anti-corrosion and insulation, instrument installation, construction of power transmission and transformation projects, sales of mechanical and electrical equipment, scaffolding erection and leasing, pipeline installation, construction engineering, building intelligent system engineering, building waterproofing engineering, fire protection facility engineering, ventilation and air conditioning engineering, construction labor, cleaning services, etc.