Werma Signaltechnik 693.010.55 Compact 36 LED Signal Stack Red Green

LED - Light Emitting Diode - a small light source

DC - Direct Current

compact - Carefuly designed to ensure an item has a minimal physical size

Red - One of the three primary colours

Colour - The categorised spectrum of light visable to humans

Compact - something that has a lot combined within a small space.

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

Voltage - A measurement of volts.

Combination - The process of two of more things being mixed or combined together.

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