Switch 1 means on and 0 means off. "1" represents the closed state, at this time the switch electronic contact is in the on-circuit state, the current can pass through smoothly, then the device will be turned on with it, "0" represents the open state, at this time the switch electronic contact is not conductive, the current can not pass through from here, and thus does not This means that the electronic contacts of the switch do not conduct and no current can pass through them, thus not switching on the device. When using the switch, be sure to look at the switch labeling before using it.