The Automatic Deployable Amp Research Boards are engaged once you open the any door of your truck or SUV. Powered by two independent motors, the Amp Steps get their signal from the door looking mechanism and works in a split second to produce a step that's fast and study. After numerous studies of different people's weights and heights, these steps offer the perfect solution for getting into your vehicle without the sacrifice of changing the way your vehicles exterior looks. All internal and external components are made to Original Equipment Manufacturers specs, OEM guidelines and are tested to withstand the elements of rain, snow, mud, heat and even for those colder climates that use salt on the roadways. The weight capacity per side is rated at 600 lbs pounds and each steps measure an impressive 79 inches in length and 6.2 inches in width.