ProSeries 12V Li-Ion Jump Starter with USB 2 Lithium-iron phosphate batteries. Scrolling digital display. Charging LED indicator. Push button controls. Dual 2.1A USB ports. 12V DC output port. Reverse connection alarm and warning. 4-gauge, 20” cables. 12V 3-pin socket for recharging. 2A external automatic charger. Rust and corrosion-proof case. Professional clamps with ergonomic grips. Meets DOE standards. Contents: (1) DSR128 jump starter (1) 100~120V AC charger (1) 12V DC car charger (1) 12V port adaptor (1) manual DSR128