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About product and suppliers:
        Alibaba.com offers 3,899 500ma output products. such as free samples, paid samples. 

There are 3,899 500ma output suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of 500ma output respectively. 

00ma output products are most popular in Western Europe, North America, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 1,155 with ISO9001, 1,094 with Other, and 117 with GSV certification.