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The switch that is called checkerboard switch is designed for the situation that we can not know which switch control which light .The difference with the traditional switch is that the push button of control plan can move and the number can add or lessen,and the quanity and location of push button is decided to the number and arrangement of the lights of different classrooms.The push button is correspondent to the lights,so you can turn on the light which you want to light. What’s more, there is a master switch,it is easy and convenienced for us to turn off all lights when you leave .Moreover ,the switch is generic,so that Mass production.
An hui university
He Fei, China