On A 3-way, there’s an extra terminal, called the “typical.” Power is available in to your switch around the popular, then two “traveler” wires hook up the first switch to the next around the brass terminals. ) You can also need a neutral wire, so it might be tough to https://smart-power-points-and-sw38762.onesmablog.com/new-step-by-step-map-for-smart-light-switch-white-clear-frame-75444742