503318 Open Relay Board W Terminals For 4-30VDC DPDT-CO PCB Relay. ..

PCB - Printed Circuit Board

LED - Light Emitting Diode - a small light source

DC - Direct Current

White - A colour combining all colours

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

Voltage - A measurement of volts.

Print - A mechanical process of putting text onto paper. It can also relate to a pattern on an item.

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