Werma Signaltechnik 420.310.75 LED Buzzer Combination Yellow 24VAC/DC

LED - Light Emitting Diode - a small light source

DC - Direct Current

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

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

Permanent - Something that is long term and most likely to be around forever.

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

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