Could it be true? Is there really a switch that uses no wires? Indeed there is. In fact, there are different varieties of these switches, some of which you may recall. Do you remember the Clapper? It was the sound activated switch that you plug into an outlet and then plug in your desk or floor lamp into it. When you clap, the the turns either on or off.
...Source: http://electrical.about.com/b/2013/07/09/a-switch-without-wires.htm
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