With the vigorous development of 3G mobile communication technology and the rapid adoption of personal mobile devices, USB interfaces have become the major data and power interfaces of smart phones and 3G wireless data cards. This has been a great help for device compatibility and resource conservation. Over the years, in addition to promoting the standardization of interfaces, the mobile industry has needed to consider how to provide better protection to the interoperability between mobile products of different manufacturers, USB cables and power adapters with USB interfaces.
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