Shenzhen Safe Guard Co., Ltd. was established in 1999. It is High-tech enterprises, Which is specializing in Researching, Developing, Producing and Selling of Intelligent security monitoring equipment, Simulation of microwave transmission, Digital microwave transmission, wireless command control, Spread spectrum microwave communication, Network multimedia monitor and so on. Serveral Technology we researched and prouduced has successfully resolved the defects when microwave encountered obstructions, it cannot be transmitted well because of inferior penetration and diffraction. These technology included: Simulation of microwave transmission, Digital microwave transmission, Wireless command control, U section, V section mobile wireless monitoring with spread spectrum and down-conversion technology. The series of products with independent intellectual property rights have been qualified by ISO9000 quality system certification and Ministry of Public Security testing & certification. The Scientific and technological content and quality is in the forefront of the world.