C series provide extra cranking capability in a compact & balanced carrying case. Great entry level jump starter. Don’t be mis-led by the compact case. Built-in sealed battery delivers high peak amps, cranking capability and durability. Feature: .Low self discharge rate sealed battery. .Heavy duty and flexible cable stay flexibility in extreme eather and easy for storage. .Big copper jaw, 400amp, coated clamps convenient for solid connection to battery posts. .Battery level self test capability. .Easy to read battery status LEDs tell user percentage of battery charged and buzzer sound warning user connect reversed .Attached charger cuts off power automatically when battery charged. .12VDC outlet equips with overload and short circuit protection for external 12V accessory. .Reverse hook-up connection safeguards battery, computer and electronic/electric components. .Some unitsequip with 120psi inflator for various inflation need. Corrosion-proof polyethylene case provides two clamp rests for cable and clamp storage convenience.