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Just one. See instructions online for your specific Caseta switch.
Sorry, there was a problem. Please try again later.Assuming your light(s) are controlled by 2 switches, this would be considered a 3 Pole set up. If you were to replace this setup with Caseta light switches (regardless of if you opt for the Caseta dimmer or a simple Caseta on/off switch) you would need one master switch for one of the light switches and a Pico remote for the other light switch. Along with the Pico remote, you would want to purchase the Wallplate Bracket so you can mount it inside the switch box like a proper switch.
I would recommend:
Sorry, there was a problem. Please try again later.Dont really need to if you get the smart remote package because you can install the smart remote on the 2nd switch socket. so you only buy the smart cassette package that comes with the remote install it on one side and the remote where the other switch goes.
Sorry, there was a problem. Please try again later.You should only need one cassette switch.
Sorry, there was a problem. Please try again later.You would use one Caseta switch and one Pico remote at the other location. See installation guide for more info. https://www.casetawireless.com/Documents/0301710%20-%203-way.pdf
Sorry, there was a problem. Please try again later.For a 3-way lighting circuit, one Caseta dimmer, such as a PD-6WCL, would be installed at one end of the lighting circuit. At the other end would be a Pico remote. You can see an illustration of the wiring here: http://www.lutron.com/TechnicalDocumentLibrary/368-4493_Page_3.pdf.
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