Function and features Safety: Auto protect while overloading Portability: light in weight, small in size, easy to carry by car Quality: offering extra-long working hours Operation: power supply by ported 12V cigarette lighter, touch button, user-friendly Apply for all kinds of family-use cars, MPV and SUV Auto protect while overloading: auto stop to ensure user safety if overloading during the jack resting, tyre blocks should be put in the front and back of the grounding tyre in case the vehicle moves. Packing: Blow-plastic box