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About product and suppliers:
        Alibaba.com offers 310 gen h4 products. About 76% of these are access control card, 9% are auto lighting system, and 4% are other access control products. 

A wide variety of gen h4 options are available to you, such as free samples. 

There are 310 gen h4 suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of gen h4 respectively. 

Gen h4 products are most popular in North America, Western Europe, and Northern Europe. 

You can ensure product safety by selecting from certified suppliers, including 155 with Other, 52 with ISO9001, and 9 with ISO14001 certification.