Cliff FC4560R Red LED Vertical Encoder

PCB - Printed Circuit Board

LED - Light Emitting Diode - a small light source

Red - One of the three primary colours

Colour - The categorised spectrum of light visable to humans

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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