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When we go to a strange place,we often press the wrong switch,so i have got this idea.Set the switch to the two-layer switch ,Lamp because the first layer button is pressed the to emit small amounts of light,Tell the user where he is,If that's not what you want lights,The first layer button will go back the user releases the hand,If that light is what you want,Lamp will shine when you press button more vigorously,This can saves probe switch time and electricity.