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About product and suppliers:
        Alibaba.com offers 3,203 5.5mm*2.1mm products. such as free samples, paid samples. 

There are 3,206 5.5mm*2.1mm suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Taiwan, 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 494 with ISO9001, 103 with Other, and 35 with ISO14001 certification.
        
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