Ronggao technology which has been devoted themselves to electric expansion doors, automatic charge system of design , production and sales . was established in 2004.A short span of four years, each year had a leap we walk from the small workshop to a factory with more than 38, 000 square meters of large-scale modern production base, from small-scale to hundreds of professional teams, and the first passed ISO9001 : 2000 international quality system certification, have access to "National Quality Trusted Products ", "China engineering construction first choice products", "China&＃039;s building materials industry well-known brand" the highest honor, these are strong-witnessed the rapid development of high technology. also stand ronggao has a new height of strategic development in the future!