Fully automatic 2-stage charging (bulk and maintenance) LED display indicates power-on, charging, full charge and check connection Short circuit and reverse polarity pretection prevent chargers from operating if improperly connected to the battery For use with 12V / 6-cell batteries (50-130 amp hour rating) that are flooded/wet cell, maintenance free or starved electrolyte (AGM) only FCC compliant UL listed to standard 1236