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About product and suppliers:
        Alibaba.com offers 1,639,598 power supply products. About 15% of these are ac/dc adapters, 4% are switching power supply, and 1% are usb flash drives. 

A wide variety of power supply options are available to you, such as 1 - 50w, >500w, and 201 - 300w. You can also choose from single, dc, and multiple. As well as from 220v, 110v, and 380v. And whether power supply is free samples, or paid samples. 

There are 1,639,714 power supply suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Hong Kong, which supply 99%, 1%, and 1% of power supply respectively. 

Power supply products are most popular in North America, Domestic Market, and South America. 

You can ensure product safety by selecting from certified suppliers, including 304,967 with ISO9001, 138,139 with Other, and 39,379 with ISO14001 certification.