Able to handle and transport most of manual wheelchair seat, suitable for indoor and outdoor use. Specifically designed for a narrow winding stair. Patented reliable step edge brakes, prevent stairclimber rush out from stair. Single-step mode and continuous mode can be selected. 3 speed settings, up to 18 steps per minute. Modular design: quick and easy to dismantle into 3 sections and re-assemble again. Equipped with overload, angle and battery indicator.