Miniatronics 3mm Blinker/Flasher LEDs [3 pcs, 1 Each Red, Green, Yellow] MNT1213103

No special circuitry required. Add a 5-6 Volt DC power source and the LEDs will blink on and off, giving a special touch to any scene. Includes resistors allowing you to run each LED as high as 15 volts DC.