When I was an electrical apprentice, I could not wrap my head around it. That is, until my foreperson sent me to see why a 3-way switch wasn't working. That was a day! Now I'm a pro, but a handy ...

Add/Relocate 3 Way Switch without Rewiring - Simply ... Small receiver fits easily in limited spaces like rose/canopy, electrical junction box, and switch box. Max Power Rating: 10A/1200W, 1000W ...