Schumacher PSW-2550 ProSeries Professional Heavy-Duty 6-12 volt wheeled charger with 250 Amp crank Assist, designed with the professional in mind, This unit features multiple charging rates for both 6 and 12 volt. A 2.25 hour timer provides ample time to charge most batteries. Over sized selector switches for easy handling with gloves on. Large face clear view meters provide data needed to diagnose and charge. The heavy duty cable set is grounded for protection and oil resistant for durability. Heavy duty steel cabinet with excellent finish provide rust protection for a long life and features heavy-duty rubber wheels for rough surfaces. High efficiency fan cooling keep the unit cool even under high ambient conditions and a 9 foot power cord provide extra reach for large garages.