Velleman VM144 Telephone Ring Detector With Relay Output Module -. ..

LED - Light Emitting Diode - a small light source

phone - Short for telephone. A device that transmits sound allowing point to point communication over long distances

Telephone - A device used for communicating audio over long distances

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

Parallel - Two objects that run symmetrically alongside each other.

Ideal - Something that satisfies a perfect criteria.

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