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Inside the early 2000’s, industry was flooded along with pre-built CCTV programs. Most of these kind of box systems which originated in China were viewed as the best during that time. However, while using advent of new technological progressions throughout optics, CMOS in addition to DSP technology, a number of these systems have become inadequate and don’t offer maximum security surveillance even on simple installations. กล้องวงจรปิดราคา