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'Switch' derives the users' intuitive, emotional approaches by adding a user-familiar interface, Power Symbol, to the power socket. It is ideal to unplug the power plugs after use for energy conservation. However, it would not get unplugged smoothly, so the users tend to leave them plugged. 'Switch' takes a new way. Simply turning it, as plugged in, will work and replace the conventional way of plugging and unplugging. The operation that the power gets on only by completely plugging in and turning, can prevent the electric shock accidents by the infants sticking in the steel bars and the fires caused by the loosely plugged power plugs.