The GOOLOO GT4000S is a powerful yet compact 4000A lithium jump starter that can start almost all 12V vehicles, including up to 12.0L gas and 10.0L diesel engines, within seconds. It supports 100W two-way fast charging and can be fully charged in about 1.2 hours, with just 5 minutes of charging enough to start a car. It also charges laptops via the Type-C port. Featuring a clear LED screen, 10-layer safety protection, long 24-month standby time, multiple USB ports, a 15V DC output, and a 400-lumen multi-mode flashlight, it works as both a jump starter and a versatile portable power bank.