Designed for professional mechanics, Schumacher's DSR ProSeries Line of wheeled battery chargers provides an array of superior-quality battery chargers with the power and features pros want. Experienced mechanics know that a powerful wheeled battery charger and engine starter is essential equipment and that DSR ProSeries chargers can't be beat. The DSR ProSeries 250-Amp 12V / 24V Wheeled Battery Charger and Engine Starter (DSR123) features 250 cranking amps (12V) engine start, 150 cranking amps (24V) engine start, 10amp-50amp (12V) boost, 10amp-30amp (24V boost, 15-amp (12V) fast charge, and 4-amp (12V) maintain modes. Fully automatic and microprocessor controlled, the DSR123 features multi-stage charging, float mode monitoring, and reverse hook-up protection. Another stand-out feature of the unit is its superior durability and construction including a heavy-duty internal transformer, rugged steel case, solid wheels, brawny copper clamps, thick 4-guage output cables, and a sturdy, retractable handle.