500 Ampere Battery Jumper is a multi-purpose emergency power source. It can be used as a power source for 12 Volt DC applications. It can also start your car engine in an emergency situation. Functions: portable and rechargeable power; 2 DC outlets; multi-functional; 260 PSI air compressor; 500 Ampere cranking power jump starter; Built-in work light, built-in battery: high grade sealed lead acid (maintenance free). Output: 12 Volt DC. Input charging source: DC with included cables. Fuse Type: 40 Ampere external. Charging Time: AC- 38 hours; DC- 12 hours. Light source: LED. Safety features: overload protection. Short circuit protection. Accessories Included: AC adapter; DC 12 Volt adapter; air compressor accessories. Dimensions: 10 inches by 7.5 inches by 12 inches, weight: 15.5 pounds.