Simply apply power and the LED will cycle through the RGB colorspace: no external controller necessary!
These bright and festive LEDs make great decorations, LED “throwies”, indicator lights, etc. 

These 5mm LEDs are of the “slow-changing” variety, meaning they cycle at a rate of one color every few seconds.

Case: 5 mm
Emitting colour + material: red, green, blue
Wave length: 620 nm (red), 520 nm (green), 460 nm (blue)
Case colour: water-clear
Luminous intensity: 750 mcd (red), 1500 mcd (green), 750 mcd (blue) (If = 20mA)
Forward current: 20 mA