Schumacher PSJ-4424 DSR ProSeries 4400 Peak Amps Jump Starter and Portable Power Unit 4400 peak amps, 500 cranking amps and 415 cold cranking amps Two 22 Ah professional grade high output AGM batteries act as an additional portable power source 12 Volt DC power outlet 3 amp built-in, automatic charger Heavy duty clamps have replaceable copper jaws