Signal Construct SMTD22438 22mm LED Indicator Lamp Blue 230VAC

LED - Light Emitting Diode - a small light source

AC - Alternating Current

Blue - A primary colour

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

Matt - A non glossy colour that light wont reflect off.

Fastening - A component hat closes or secures, e.g. a coat zip.

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