US20 Charger, 6/12V 40/40/10A, 200 Amp Cranking Assist, Wheels (With Timer) US20 40 Amps 6V-12V Automotive Battery Charger Fan cooling mechanism prevents overheating and extends the charger’s life Heavy-duty vacuum impregnated transformer seals the unit against external agents Patented multi-diode rectifiers activate in case of unit failure 400 amp fully insulated “Flexi-Spring” clamps ensure a tight hold and prevent arcing Patented “Stop/Go” light for easy operation Automatic timer and AC/DC reset breakers provide added circuitry protection Rated for 40 amps continuous charge at 6V and 12V with 200 amp crank assist at 12V operation Rugged 7 in. tires and durable chrome handle for simple transportation