3 Black Wires And 3 White Wires Light Switch. Here I'm showing how to install the belkin wemo smart light switch when the switch that you take out has more black wires than anticipated. The other light switch has a white wire in the same place.
You connect all white wires together in each box. The black wire is the hot wire that leads to the switch. You can see (if you trace through the wires and the switches) that in the previous figure, the light is off.
There are exceptions with old wiring and with dead end three-ways.
Remote receivers will have DIP switches, or a series of button, and three or four wires.
But of course, the light itself will need that white wire (neutral) to power up. Copper or green wire is the ground wire and keeps Turn off the electricity. The old switch was attached with two blacks inserted into the back of the switch with another black attached to the Turn the power off and mark the wires before you disconnect them.