Cliff FC4561RGB Red/Green/Blue LED Vertical Encoder With Switch

PCB - Printed Circuit Board

LED - Light Emitting Diode - a small light source

Blue - A primary colour

Red - One of the three primary colours

LED - Light Emitting Diode. A bulb that is very efficient at producing light. Often small.

Rotary - something that revolves around an axis, for example an engine.

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