Features and Benefits Boost 12 Volt and 24 Volt vehicles with two 22 Ah batteries with 4400 peak amps 500 cranking amps and 415 cold cranking amps 3 amp automatic built-in charger; will not over-charge the battery and will recharge the battery up to 3 times faster Built-in fan for cooling and venting 55 inch 2 gauge welding wire cables with heavy duty clamps with replaceable jaws On/Off switch digital display and reverse hook-up alarmDSR Professional grade high output AGM battery especially formulated to jump start vehicles, 3 Amp built in automatic charger will not over charge the battery, Two function digital display indicates internal and vehicles battery voltage and percentage of charge when charging the internal battery, Display also indicates charging system voltage while engine is running, SKU: DOBA13121