Werma Signaltechnik 425.120.75 Flash/Horn Combination 425 Red 24VAC/DC

LED - Light Emitting Diode - a small light source

DC - Direct Current

AC - Alternating Current

Diameter - A measurement across a circle passing through the middle

Grey - A colour often associated with old age (going grey)

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

Wall - A physical barrier between two areas

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.

Dome - A curved shape usually seen on building structures.

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

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