6 - 2A charge maintain, 15 - 40A boost/service mode. Product Features:125A Engine Start - powerful enough for SUVs, trucks and large enginesBoost mode - quickly brings deeply discharged battery back to lifeService mode - maintains voltage at 13.6V to prevent dischargeBattery testerScrolling digital displayHeavy-duty construction125A clamps with copper cableBuilt-in cord managementAuto voltage detectionReverse hook-up protectionSchu Eco Energy - meets the highest industry standardsDOE compliantContents: (1) DSR118 battery charger (1) manual