The Kwikee 35 Series Single Electric Step by Lippert Components automatically extends when you open your RV door and retracts when you close your RV door. The power step will automatically stop if it strikes an obstacle. Weatherproof wiring and connectors prevent shorts and corrosion in the system. Motor, Control Unit and Switch Kit included. Features: Supports up to 750 lbs. Heavy-gauge steel and black powder-coated finish for long-lasting durability. Solid steel drive rods and stainless steel bushings. Sealed wiring connectors stand up to the elements. Hidden amber light guides user in the dark. Step automatically stops if it strikes an obstacle. Rise: 5 in; Run: 10.75 in; Tread: 24 in; Mounting Bolt Pattern: 8 x 22 in. Limited warranty. Note: This is Kwikee Part Number 903509025.