Technology research and development, technical services, maintenance and agency services for mobile police stations, new energy electric vehicles, electric patrol cars, and police equipment; research and development, sales, maintenance and leasing of drones, drone detection and drone signal interference systems; drone aerial photography and surveying services; computer software, hardware and network technology development and sales; graphics Such as the development and sales of identification and processing systems; the design, construction and maintenance services of communication engineering and security engineering; the sales and leasing of mobile police rooms, cars, auto parts, motorcycles, police equipment, fire protection equipment, environmental protection equipment, and security equipment; the sales of household appliances, communication equipment, electronic products, office supplies, clothing, shoes and hats.