5mm <a href="https://en.wikipedia.org/wiki/Light-emitting_diode#RGB_systems" class="extiw" title="w:Light-emitting diode">RGB LED</a>.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/snazzyguy/3699433096/">RGB LED - RGBL-01-05</a>