Shenzhen Think Science Co.,Ltd is a professional high technology enterprise in the research, production and marketing of the built-in surveillance and security products, Our products include many kinds of CCD Cameras, Quad Processor, DVR , DVR Cards, A/V wireless transmissions and other surveillance products . Can meet requirements of different environment and different level applications. www.thinkwaytech.com contact email: paulacctv(a)126.com