This is a 4000A portable vehicle starter charger. It easily starts engines up to 10 liters, both gasoline and diesel. One charge is enough for 40 starts. Even with a severely discharged battery below 9V, pressing the "Boost" button is guaranteed to start the engine. Apart from the main function, it is also a powerful 24000 mAh portable battery with gadget charging function. There is also a built-in 500 lumen LED flashlight with three modes of operation. The device is protected from water and dust, works in extreme temperature conditions, and has a shockproof case.