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Shenzhen Yongchangda Electronics Co., Ltd., mainly engaged in car,gas,carbon monoxide,heat,smoke,water leakage alarm,fire alarm system,and industrial gas sensor.passed the ISO9001: 2000 international quality management system certificate,and all of the products according to CE standard.After several years of hard work, foreign markets exported to the Americas, Europe, Australia, Middle East, Southeast Asia.We are manufacturer,so we can prodvide good quality and best price.Striving for security alarm brand,it is the target of Yongchang. We firmly believe that: only the leading product technology, excellent product quality and all the pre, sale, service system, coupled with market rules of the marketing strategy, so that we lead the forefront in the security alarm industry!