The dormitory only has USB charging socket, so you can only use USB desk lamp and USB charging bank. Or open the outlet, find the 220 volt AC wire, draw out the neutral and live wire, and connect to a 220 volt strip.
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Only the usb interface in the dormitory means that high-power equipment cannot be used, only small electronic products such as mobile phones can be charged, can not be changed privately, so as to avoid accidents, if the private change line is found, it will be punished, and serious may not be allowed to continue to use the dormitory.