The 4001 a 12/24 Volt commercial jump starter from SOLAR is a versatile unit that provides endless jumps for auto lots auction houses fleet operations implement dealerships agricultural operations construction operations and other environments where heavy duty jump starting is a regular occurrence. Model No. 4001 accommodates two user-installed batteries (up to Group 31 size) to deliver its jump starting power and features 10-foot 1/0 jumper cable leads enabling easy access to the starting points on vehicles of all shapes and sizes. It features an enhanced automatic charging system that enables easy charging and maintenance of the installed batteries when not in use. The charging system can be optimized to properly charge both flooded or AGM battery types.