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About product and suppliers:
        Alibaba.com offers 3,187 5.5mm*2.1mm products. such as free samples, paid samples. 

There are 3,198 5.5mm*2.1mm suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Hong Kong, which supply 99%, 1%, and 1% of 5.5mm*2.1mm respectively. 

.5mm*2.1mm products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 502 with ISO9001, 125 with Other, and 28 with ISO14001 certification.