Stanley Fat Max 450 Amp Jumper with Compressor has 450 amps of instant starting power, with 900 peak amps of power. It includes a 120 PSI compressor, DC charging plug, heavy duty metal clamps, AWG cables, and a high powered LED light. This starter features a reverse polarity alarm for safety along with a metal handle grip and impact resistant injection molded housing. It consists of a power or charge indicator and reverses polarity alarm. Finally, the slim design makes storage of the jump starter in your vehicle easy.