Barthelme 58931214 19mm LED Signal Lamp Blue 12V Flashing With Aud...

LED - Light Emitting Diode - a small light source

Diameter - A measurement across a circle passing through the middle

Blue - A primary colour

Audio - Also known as sound. An audible vibration wave which can be heard.

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

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