2/12/30/100A 6V/12V DOE Battery Charger. Microprocessor controlled to automatically adjust the rate to charge and maintain battery. Monitors and maintains battery when fully charged and resumes continuous charging when battery becomes discharged. 80A engine starter powerful enough for starting cars, SUVs, and small trucks. LED indicators and button controls on dash for ease and accuracy. Reverse hook-up protection ensures charger will not operate if clamps are reversed.