This easy-to-use trailer jack will raise and lower your coupler with the press of a button. Simply use the 12V power cord with standard 4-flat trailer wire plug that connects directly into your vehicle's trailer light plug. Powerjack housing has built-in compartment for secure storage of the power cord. High-impact construction is protected by Dacromet anti-corrosion coating with self-repairing action that fills damaged areas with zinc oxides and carbonates. Trailer jack installs on your trailer frame with U-bolts. Manual crank and hardware included.