From Schumacher's Farm & Ranch line, the FR01235 Fully Automatic Smart Battery Charger with Engine Starter is energy efficient yet powerful enough for jumpstarting SUVs, trucks and large batteries. Easy to use controls allow you to choose between a 100A engine start or 30A quick boost with 62A charge/maintain rates. With convenient automatic features, this microprocessor-controlled unit will auto-adjust the amperage rate and can auto-detect 6 or 12 volts. Multi-stage charging adds precision, safety, and battery power, while float mode monitoring automatically maintains optimum battery life. Also featuring reverse hook-up protection with an LED warning light that prevents the charger from operating if the clamps are incorrectly connected.