Hello Sonoff 
I would like to buy a Sonoff 2-way switch. The 2-way switch, which will replace a regular 2-way switch, features 1 input and 2 outputs. Remember, there are only 2 wires going from switch to switch and only 1 has power supplied. Of course they can be 1gang, 2, 3…
A diagram is attached. I know it’s a challenge.