Werma Signaltechnik 422.110.75 LED Buzzer Combination Red 24VAC/DC

LED - Light Emitting Diode - a small light source

DC - Direct Current

Wall - A physical barrier between two areas

Red - One of the three primary colours

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

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

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