This Schumacher "Portable Power" unit has an air compressor, a 400W DC to AC power inverter, and a work light. The on/off jump-start switch eliminates accidental clamp shorting. Heavy-duty, copper-jaw, spark-resistant clamps fit both top and side-post batteries. It features a 110 volt charger for automatic charging of internal battery, and clear LEDs indicate the internal battery status. The 12 volt accessory port has overload and short-circuit protection. 18 ampere hour battery. A great power backup during severe weather conditions!