Kingbright KM2520SRD09 2.5mm Super Bright Red LED Axial Miniature. ..

PCB - Printed Circuit Board

LED - Light Emitting Diode - a small light source

LENS - An optical element which converges or diverges light

UK - United Kingdom - An island nation in Europe

water - A chemical substance. Chemical formula H2O.

Red - One of the three primary colours

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

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