At 3 V operating voltage can only 1 LED per channel can be connected. At 6 V operating voltage, up to 2 LEDs per channel can be connected. Except for the blinking electronics are currently 2 capacitors and 2 resistors. Of the resistors is only one resistor is fitted, depending on the operating voltage. The two attached capacitors are connected according to drawing with the blinking electronics (solder). LEDs are not included. As the LEDs can be commercially available LEDs (red-green-yellow) can be connected and a operating current of 10 - 20 mA and a voltage between 1 - 2 V. Special colors such as blue and white have mostly an operating voltage of 2.5 - 3.5 V. If these are to be connected, then you can use per output only 1 LED connect and you need the Flash electronics with 6 V (3 V operating voltage is too low).This text is machine translated.