Which operates just like a momentary push-button required a spring to return to their un-pushed state. We push a cord to plug in. But, when plug out, we don't pull a cord out from a socket. We push to plug out, the most convenient way to plug-out we offer. We usually use force to make a cord into a socket and use force to pull it out from a socket. However, our invention doesn't have to apply such manpower to plug in or out. An energy saving device. When returned to its un-pushed state, just like a push-button switch in power-off, the cord stays but is completely disconnected.