The registration address of daewooyu technology ltd., shenzhen city, is located in sakada street, shenzhen city, on the streets of shenzhen city, and in building b of the bool industrial park, fourth industrial district, shenzhen city. The registration authority is the market supervision authority of shenzhen city, which operates on behalf of li jianping and covers the development and sale of electronics technology; closed-circuit surveillance systems, anti-piracy systems, building-to-mouth systems, door-to-door systems, video electronics technology development and marketing; the design and construction of security technology protection system works; domestic trade; and the import and export of goods and technology。