Signal Construct SMFP30H0249 30mm 24-28VAC/DC IP67 Red LED Indicat...

LED - Light Emitting Diode - a small light source

DC - Direct Current

AC - Alternating Current

Brass - A copper and Zinc Alloy

LENS - An optical element which converges or diverges light

Chrome - A shiney metalic finish where chromium is electroplated onto an object

Red - One of the three primary colours

Chrome - A shiney bright metalic coating of chromium applied to metals

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

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