Portable and easy to use. This wheel charger features LED indicators and button controls for easy reading and accuracy. It can charge both a 6 V and/or a 12 V battery. At 6 V, this wheel charger can charge at 2 A trickle and 10 A standard. At 12 V it can charge at 2 A trickle, 10 A standard, 40 A quick charge and 200 A engine start. Using the 200 A emergency start setting is powerful enough to bring cars, large SUVs and small trucks back to life.