CML 19TR0I24 LED Indicator Lamp Tri-Colour Red, Green, Yellow 24V.
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LED - Light Emitting Diode - a small light source

DC - Direct Current

Yellow - A primary colour. The sun is often described as yellow

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.

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