UltraSafe 2.0 - We took our UltraSafe technology and made it better. This isn't an upgrade. Maximum Versatility - Boost X is one of the most versatile lithium jump starters ever. Jump start all vehicle types, including cars, motorcycles, trucks, ATVs, boats, RVs, vans, SUVs, tractors, and more for up to 7.5-liter gasoline and 5.0-liter diesel engines.