This switchable protective contact adapter plug with a twopole switch (switch position 0 = off, switch position I = on) allows switching from continuous current to volt-free. Devices with what is known as stand-by technology are still live even when they are idle; that is, when they are not in use. This may cause poor sleep or have other adverse effects for sensitive people. By pressing the switch on the side, the voltage state on the connected devices is cancelled – both inside the device and in the lead. This function is the same as that of a switchable power strip.