Shenzhen Shan yi Shi da Electronics Technology Co.,Ltd is a high-tech enterprise engaged in the development, manufacture and distribution of surveillance equipment and security products. We offer Video Door phones, Underwater Cameras/Monitors,Pipe Inspections,CCTV Cameras, IP Cameras, , etc. Our products are widely used in many fields and contributed to hundreds of projects. They have also passed the inspection and test by the institution of police. We have nearly 60 seasoned researchers ...