PST is located in Shenzhen, China. We are a large-scale professional manufacturer, integrating the R&D, manufacturing, developing, marketing and after-sales service of over 1000 kinds of security products, such as home alarm systems, car security systems, GPS trackers, CCTV surveillance systems and video door phones etc. All products manufactured and sold by PST are approved and certificated by FCC, CCC, CE, UL and RoHS. Because of advanced equipment, fruitful technical support, effective ...