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light-emitting diode: a semiconductor diode that emits light when conducting currentand is used in electronic displays, indoor and outdoor lighting, etc.
Definition from: http://www.dictionary.com/browse/led
Pack of 3.
Red Laser Diode Line Pointer Module 650nm 5mW
10 Segment Led Bargraph Light Display Red Yellow Green Blue
5 PACK Rectangular LED QuasarBrite Red 5mm 2V 635nm
5 PACK Ultraviolet LED Light Emitting Diode 5mm