This fully automatic microprocessor controlled 100 ampere engine start is perfect for emergency starting. It features a 5 ampere, 10-20 ampere fast charge which has self-adjusting, variable charge rates for everyday charging needs and maintaining your battery in peak condition. Charges and automatically desulfates and restores car, truck, RV, farm equipment, AGM, gel cell and deep-cycle batteries. A secondary feature is the 3 ampere slow charge for charging and maintaining small batteries, motorcycle batteries, ATV batteries, snowmobile batteries and lawn tractor batteries. With a built-in digital voltmeter/tester, you can easily diagnose problems. An auto voltage detection means the charger automatically determines whether the connected battery is a 6 volt battery or a 12 volt battery.