This high performance charger operates as fully automatically or manually. For charging 12V battery systems, the unit offers over-sized heavy-duty selector switches and rotary output switch selects between, 300 Amp engine start, 70 Amp rapid charge, 40 and 20 Amp fast charge and 4 Amp slow charge. The precision timer controlled operation offers a 2.25 hour timer with Off and Hold positions for controlled or continuous recharging. Large face, clear view ampere and volt meters have easy to read graduated scales. The tubular chrome plated handle has a rubber grip and unique non-conductive clamp rest. Includes an array of clamps and cables, 600 Amp heavy duty, chrome plated steel ultra grip clamps, 6-foot long heavy duty commercial gauge welding grade cables and extra long 9 foot AC line cord. A high volume cooling fan makes for efficient cooling and longer duty cycles. This unit is a durable, heavy duty steel cabinet with wide track wheels.