With it, you can safely jump start a dead battery in seconds - up to 20 times on a single charge. It's a mistake-proof portable car battery booster jump starter battery booster pack, making it safe for anyone to use and features spark-proof technology, as well as reverse polarity protection. The GB40 portable car battery booster jump starter integrates with a high-output 100 lumen LED flashlight with 7 light modes. Including low, medium, high, flashing, strobe, and emergency SOS. It can hold its charge for up to one year without being recharged. Its internal battery can be used to charge any personal mobile devices like smartphones, tablets, or any other USB device, plus rechargeable from any powered USB port. It's rated at 1000-amps, and suitable for use on petrol engines up to 6-liters and diesel engines up to 3-liters, such as a car, boat, leisure, caravan, and more.