Solid performance, innovative design, and long-lasting durability make the Schumacher DSR ProSeries 250A/125A 6V/12V Battery Charger and Engine Starter (DSR131) a great choice for professionals. It is energy efficient and fully automatic. Microprocessor controlled, the DSR131 features multi-stage charging, float mode monitoring, auto voltage detection, and reverse hook-up protection. The unit offers 250A (12V) engine start, 125A (6V) engine start, 50A boost, 6A charge, and 2A maintain rates. Product Features:250A engine start (12V), 125A engine start (6V), 50A boost, 6A charge, 2A maintainCharges standard, AGM, gel, and deep-cycle batteriesPowerful enough for SUVs, trucks, and large engines50A Boost mode quickly brings deeply discharged battery back to lifeDigital display, LED indicators, and push-button controlsStart/Stop interface12-foot reach, 6-gauge output cablesHeavy-duty 300A color-coded clampsMicroprocessor controlled and automatically adjusts the amperage rate to charge and maintainMulti-stage charging for added precision, safety, and battery lifeFloat mode monitoring automatically maintains optimum battery chargeAuto voltage detection of 6V or 12V batteriesReverse hook-up protection