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About product and suppliers:
        Alibaba.com offers 623 sdi dvr products. About 43% of these are cctv dvr, 10% are cctv camera, and 4% are car black box. 

A wide variety of sdi dvr options are available to you, such as free samples, paid samples. 

There are 589 sdi dvr suppliers, mainly located in Asia. The top supplying countries are China (Mainland), South Korea, and Taiwan, which supply 89%, 7%, and 1% of sdi dvr respectively. 

Sdi dvr products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 145 with ISO9001, 46 with Other, and 10 with ISO14001 certification.