This is how i modifie a sonoff wifi switch to give a volt free contact output this lets me use this device to control many other devices that have a low voltage control circuit or a circuit that needs isolation from mains voltage this will now let this device to be used to upgrade simple dumb EV chargers to timed chargers or even some smart chargers that for some reason do not want to do timed charging . this will be followed by a vidio showing how i fit this to a EV charger