Our Talking Skull LED Eyes were desgined to work with the PicoTalk-3 controller that is contained inside the Talking Skull. If you would like to use the LED Eyes alone you will need to use a 560 ohm 1/2 watt resistor so that they can be powered from one of our 12VDC power supplies. Each eye requires its own resistor. You can get the 560 ohm 1/2 watt resistors from here.