The electric car jack must be used on a flat and firm ground Remember, never to use it on a sloped ground! Turn on the warning light as a reminder, park the car well and ensure that the car has been braked safely. Our electric car jack Heavy-duty steel construction, large base and saddle make this car jack strong and stable. wear-resistant.contact suface and compact triangle design for extra stability Best choice for Sedan and SUV(under 3T): Two removable raised heads are respectively designed for Sedan and SUV. Vehicles under 3 ton can be easily lifted, but DO NOT use it on the trucks and those beyond 3 ton. Two-way Power Supply: It can be connected to either a 12 V outlet or car battery, two connector choices make it a necessary car repair tool when run into roadside emergencies. reinforced solid screw rod makes the electric car jack will not easily be torn apart or twisted