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About product and suppliers:
        Alibaba.com offers 1,438 4.5v usb power products. About 7% of these are power banks, 6% are charger. 

A wide variety of 4.5v usb power options are available to you, such as free samples, paid samples. 

There are 1,364 4.5v usb power suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Taiwan, which supply 98%, 1%, and 1% of 4.5v usb power respectively. 

.5v usb power products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 277 with ISO9001, 208 with Other, and 54 with BSCI certification.