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What Is a 3-Way Switch? Parts and Wiring
How to Wire a 3 Way Switch
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.co.uk:
How To Wire a 3-Way Switch: Diagrams and Instructions