How do 3-way (2 switches for 1 light) smart switches work? Do I buy 1 or 2?

Thanks for the suggestions, everyone! I have learned a lot from your replies and now I have to consider if I want to do an in-wall solution like the sonoff or shelly 1, or if I want to go for switch replacements.

Re to tom_l I never changed the title of this post and I have no clue what you’re talking about.

I was talking to czechlion. He was confused about your question:

Though he deleted this, (it is still visible in the edit history) after I pointed out that the answer was in your title.

czechlion also insists the title was edited.

If it wasn’t edited by you, then a forum member with Regular or above privileges might have, or czechlion has misremembered.

Either way it’s not that important and I’m glad you got a satisfactory answer to your question.

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Oh okay that makes sense
The title has not been edited that’s what I originally put in yesterday when I posted it
So I have no clue what czechlion is on about then heheh

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