The CRAFTSMAN CMXCESM281 is the only tool you need for reliable jump starting and portable power. The CRAFTSMAN CMXCESM281 1000 Peak Amp Jump Starter and Portable Power Station features a microprocessor-controlled jump starter that fully automates engine starting. With 1000 peak amps this jump starter features enough power to consistently jump start up to V8 engines. The built-in 4-gauge, 30-inch booster cables with heavy-duty metal clamps ensure secure connections and efficient transfer of power. A reverse hook-up alarm alerts the user if the clamps are reversed, preventing damage to your vehicle and the unit. The second major function of the CRAFTSMAN CMXCESM281 is as a portable power station. In addition to a 12V 6A DC port to power DC devices, the unit features a four-port USB hub. The hub features four 2.4A USB ports optimized for Apple and Android devices. Other features include a built-in LED area light, a digital display, and LED indicators.