15a, 6/12v, fully automatic battery charger, micro processor controlled, automatically adjusts the amperage rate to charge & maintain, multi stage charging for added precision, safety & battery life, auto voltage detection, reverse hook up protection, charger will not operate if clamps are reversed, led will flash, energy efficient charger is full automatic & easy to use, 6' power cord, 1 year warranty, 50 state doe compliant.