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Smart Electronics 4pin RGB Module KY-016 Three Colors 3 Color RGB LED Sensor Tt Bike Maintenance & Tools If you want two-way communicationsITEM NAME: Smart Electronics 4pin RGB Module KY 016 Three Colors 3 Color RGB LED Sensor Tt. The RGB tricolor current limiting resistance to prevent burn out. To prevent burn resistor LED. (3) is obtained by PWM adjusting three primary colors can mix different colors. With a variety of single chip microcomputer interface.