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Daily life, different small electrical appliances and electronic products have different power connections, there are two kinds of plugs and USB connections, Universal Plug the USB plug and the combination makes it not because the charge and then put on a USB cable, also avoid the issue because there is no USB interface, digital products without charging problems.There is a change devince in the top of plug ,it can make the voltage from 220V into 5V.
Jiangxi University of Finance and Economics
Jiangxi University of Finance and
Guanglei Huang，Min Wei，Zhongbiao Jiang， Luting Xia，