The Kwikee Electric Step by Lippert Components automatically extends when you open your RV door and retracts when you close your RV door. The power step features an automatic shut-down if the step strikes an obstacle. Weatherproof wiring and connectors prevent shorts and corrosion in the system. Mounting Bolt Pattern: 8 x 22". Supports up to 750 lbs.Heavy-gauge steel and black powder-coated finish for long-lasting durabilitySolid steel drive rods and stainless steel bushingsSealed wiring connectors stand up to the elementsHidden amber light guides user in the darkStep automatically stops if step strikes an obstacleRise: 7"; Run: 10"; Tread: 23.75"Limited warranty Models that include the control unit are also equipped with an ignition switch and actuated override circuit built in. When the door is closed ane your step is still down, the moment you turn on the ignition switch, the step comes up automatically. This eliminates the need for any warning lights.