Buttons

4 pin led buttons

4 pin Philmore .110" Quick Disconnect Terminal

The 2 pins on the gray rectangular platform in the center are for control or button press. Just closing a circuit. Polarity doesn't matter.

The 2 pins close to the edge are for LED. Polarity does matter. Sometimes the pin has a red tip to indicate voltage.

3 Pin LED Button. Takes different 3 pin cables for newer style USB Encoder