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Where is the button? / socket

Where is the button?
Where is the button?

The power switch is made inside of the socket ,which means pluging in and switching on or pulling the plug and swiching off are on the same action.In other words,everytime you are available to the sheet metal on the plugs,the power has been cut off.Therefore,electric shocking is impossible.

University

Wuhan University of Sci-Tec

Wuhan University of Sci-Tec
Wuhan, China

Yi Zhou,
Wuhan university of science and technology