The 12V/24V 4400 Peak Amp Portable Jump Starter & Power Supply, No. DSR166, from Schumacher Electric features an internal charger that provides 4,400 peak amps, with two internal high-output AGM batteries that deliver 525 cold cranking amps for 12V systems, and 350A 24V systems. The full jump pack includes an easy-to-use digital display to check battery percentage, 2-gauge jumper cables, an on/off switch, and reverse hook-up warnings for when a battery is connected incorrectly. Each jump starter also functions as a portable power source with a 12V DC power outlet and a 2.1A USB port to charge and run mobile phones, tablets, or other accessories.