microtivity IL613 5mm Diffused RGB Controllable LED, Common Cathode (Kit, Pack of 30) 30x 5mm Diffused RGB Controllable LEDs Comes with 3 2N2222 transistors and some resistors. Connect them to different voltages to produce different colors. Common Cathode. Please refer to the product images for connection diagram Forward Voltage: Red 1.8-2.0V, Green and Blue 3.0-3.2V