If you’re adding a 3-way setup to an existing situation, this cable should be present already. Run a 14-3 NM-B cable (white, black, red, bare copper) from your first switch to the second switch.

Learn how to install 3-Way Smart WiFi light switches with this step-by-step video. Please consult a certified electrician if you have any questions or concerns. Every wiring setup is unique, so be ...