How to Wire 4 Pin LED Switch | 4 Pin Led Switch Wiring
How a 4-Way Switch Works
TREATLIFE 3 Way Smart Switch 4 Pack, 2.4GHz WiFi Light Switch 3 Way Switch Works with Alexa and Google Home, Needs Neutral Wire, No Hub Required - - Amazon.com
Leviton Decora Smart Switch Anywhere Companion, Add Wire-Free 3-Way/4-Way/5-Way On/Off Control to Decora Smart Wi-Fi 2nd Gen Switches, DAWSC-2RW, White - - Amazon.com
radiant® 15A 4-Way Switch, White | Designer Switches and Outlets | Wiring Devices