Safe & Easy to Jumpstart: All information about the product status is intuitively displayed on the 3.2-inch LED screen. Built-in 10 kinds of protection technology to free your mind of misgivings of misoperation and sparks.It's a compact yet powerful portable jump starter battery pack for starting 12.0L gasoline engines or diesel engines up to 10.0L in just a few seconds. Unique Pre-heating Tech：Only the GT4000 lithium jump starter is equipped with advanced pre-heating technology, making it the ultimate companion for winter driving. Even in extreme cold environments as low as -40°F, the GT4000 can effortlessly jump-start a dead vehicle battery. 100W Max Two-way Fast Charging: Only takes 1.2 hours to fully charge the car battery charger jump starter from 0% to 100%. 5 minutes of charging time are enough to start a car. (100W car charger is included in the package).You can also use your own fast-charging charger to charge this jump starter through the type-c port. Up to 100W Charging Speed for MacBook & Other Laptops: Charge it whenever and wherever as fast as the original adaptor for your laptops(Type-C port only). Emergency Life Saver: Not only a car starter,the GOOLOO GT4000 also features as a power bank includes three USB Ports (PD100W TYPE-C 5V/3A In&Out, USB 5V/9V/12V Quick Charge, USB 5V/2.4A ), and a 400 lumen LED light with 3 modes(SOS, SPOTLIGHT, STROBE).Plus a 15 volt 10 Amps port for powering any 15V or 12V DC devices, like tire inflators, inverters, and more.