Signal Construct SKHD05402 LED Indicator 5mm Mounting Blue 12-14 V...

LED - Light Emitting Diode - a small light source

DC - Direct Current

AC - Alternating Current

LENS - An optical element which converges or diverges light

Blue - A primary colour

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

Voltage - A measurement of volts.

Head - The upper part of a body typically separated by the neck.

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