3.There's nothing worse than being stuck with a dead car battery, especially when you're busy and on a tight schedule. You can't always rely on someone nearby having jumper cables, either. And you definitely don't want to pay a professional if you can. A reliable portable car battery charger jump starter is essential for bad weather, vehicles with older batteries and unforeseen circumstances. As soon as your car battery dies, you can get it up and running almost as quickly. Portable car jump starter is so much more convenient than old jumper cables. Everyone should have one. The GOOLOO GP4000 is a portable and powerful device that combines three different products, a backup power bank, a battery jump starter, and an LED work light. The product is compact and can be easily placed in a pocket or stored in a glove box. Do not waste your money buying these other devices separately, instead just buy the GOOLOO. 4000A Peak Current, 99.2Wh High Capacity. The GOOLOO Supersafe Lithium jump pack can boost all gas engine and up to 10L diesel engine. After a full charge( 5-9 hours ), it can work up to 60 times for vehicles, motorcycles, trucks, boats and more. Dual USB Ports with Quick Charge & 5V 2.1A -- Ensures the fastest charging efficiency, 4x faster than conventional charger. Backward compatible with QC 1.0 and 2.0. It works as a compact portable 15V/10A(max) DC power source for 12V DC devices, such as tire inflator, car refrigerator cooler, car vacuum cleaner and so on. The LED light has three modes: Flash light, Strobe light and SOS light. It can help you In any situation especially for adventure, outdoor, indoor, emergency, travel, etc. The GP4000 Smart Jumper Cable are constructed with all-metal clamps to prevent breakage caused by long-term use. And it has 10 protections, including overcurrent protection, overload protection, overvoltage protection and overcharge protection, making it totally safe for anyone to use.