RunLessWire - The Original Self-Powered (NO Batteries) Wireless Light Switch & Receiver Kit, No WiFi Needed, DIY, Remote 150+ft | Kinetic Self-Powered Wireless Switches
3 Way Wireless Light Switch, No Wiring, No WiFi, 100ft RF Range, Pre-Programm... | eBay
Wireless Switch Kit Amysen : WiFi Remote Control Light Switch and Receiver No Battery No Wiring, Compatible with Alexa and Google Assistant & IFTTT, ETL Certified, Only Supports 2.4GHz Network: Amazon.com: Tools
Kasa Smart 3 Way Switch HS210 KIT, Needs Neutral Wire, 2.4GHz Wi-Fi Light Switch works with Alexa and Google Home, UL Certified, No Hub Required, White,2 Count (Pack of 1) - Amazon.com
Kasa Smart 3 Way Switch HS210 KIT, Needs Neutral Wire, 2.4GHz Wi-Fi Light Switch works with Alexa and Google Home, UL Certified, No Hub Required, 2-Pack - Newegg.com