... selecting and Leveling Device, Elevating Limiter, Rope Protection Device, Parking Safety Device, Bumper, Upper and Lower Height Restrictor, Anti ... ,Compared with the previous generation products,its function,safety and usability and stability have been greatly improved. ... High Security1.Overload protection 2. Losting-phase protection 3.Safety door protection 4. Interlayer door protection 5. Motor ...