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Shenzhen Professional Security Technology Company is a large-scale professional manufacturer who dedicated in a series of security products’ developing, producing, selling and after-sales service. The major products in PST are: home alarm system, car alarm system, CCTV series and Video door phone (Intercom) etc over 1000 kinds of security products. And all the products produced and sold by PST are approved and certificated by FCC, CCC, CE, UL and RoHS ...