Replacing 3 Way Light Switch One Has 4 Wires

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Neutral Necessity: Wiring Three-Way Switches | JLC Online

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I’m trying to change a light switch. i have two black wires and one red2 way switch wiring diagram Help! wiring a dimmer switch. what goes where???Replacing a 3-way switch with a tp-link hs-210 3-way smart switch.

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