POWERFUL PERFORMANCE: The unit delivers 4000 peak amps from a 12V high-output AGM battery, packing the muscle needed to jump start large engines. PORTABLE POWER: The 12V DC port can be used to either power 12V devices or for recharging the jump starter in your vehicle on the way to your next destination. The 2.1A USB port lets you charge all your electronic devices. DURABLE AND RELIABLE: The internal battery can provide 700 cranking amps, providing quick starting in emergencies. The sturdy build of the rust and corrosion-proof case and tough 2-guage cables will ensure years of reliable power. EASY TO USE: Heavy-duty metal clamps allow for secure connections even for hard-to-reach batteries. The digital display shows the internal battery percentage or battery voltage at the touch of a button. REVERSE HOOK-UP WARNING: With a reverse hook-up warning, you can prevent damage from clamps that are not properly connected. Included components: jump starter, user manual