Lutron devices use a Lutron proprietary protocol called Clear Connect. I believe it operates at ~900MHz, which is why the Lutron SMart Bridge Pro is a requirement. Aesthetically, the Prico remotes are great in the US where Decora/Paddle style switches are commonplace and easy to source. Not sure how well suited they are to Europe, where the light switches are often more square shaped, correct? I know in my house my wife and family prefer the smart-switches to look and behave more like traditional switches.
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