15A rapid, 8A standard charger and 3A maintainer for auto and marine Digital display Microprocessor controlled - automatically adjusts the amperage rate to charge and maintain Multi-stage charging for added precision, safety and battery life Float mode monitoring - automatically maintains optimum battery charge Auto voltage detection - 6 or 12 volt Reverse hook-up protection - charger will not operate if clamps are reversed, LED indicator will flash Energy efficient - meets the highest industry standards