BEIJING DEPENDABLE TECHNOLOGY & SCIENCE DEVELOPMENT Co., Ltd. was established in 1995 and located in Zhong Guan Cun high technology district, Beijing. It is a high and new technology enterprise integrated with science development, production and trade. The main products are family/industry series combustible gas detector, alarm controller and toxic gas alarm device. The industry series products are mainly used in the fields of petrochemical industry, chemistry industry,metallurgy, pharmacy, fire fighting, etc. The family series products including ceiling/wall mounting combustible gas detector are specially designed for high-grade apartment, hotel etc.