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About product and suppliers:
        Alibaba.com offers 3,853 usb hand warmer products. About 59% of these are power banks, 20% are electric heaters, and 5% are rehabilitation therapy supplies. 

A wide variety of usb hand warmer options are available to you, such as blue, black, and beige. You can also choose from 4001-5000(mah), 3000-4000(mah), and 10001-15000(mah). As well as from free samples, paid samples. 

There are 3,861 usb hand warmer suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Taiwan, which supply 98%, 1%, and 1% of usb hand warmer respectively. 

Usb hand warmer products are most popular in North America, Western Europe, and Eastern Asia. 

You can ensure product safety by selecting from certified suppliers, including 1,903 with ISO9001, 1,065 with Other, and 352 with BSCI certification.