UltraFire C2 Cree Q5 5-Mode LED Flashlight (3.6V~9V Input)

LED - Light Emitting Diode - a small light source

LENS - An optical element which converges or diverges light

Glass - A solid, typically transparent. Brittle and used in windows. The first patent granted in the UK was for Glass.

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

Voltage - A measurement of volts.

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