... and easy maintenance.Has a compact structure,excellent ladder road,refind lead the way,beautiful appearance, ... space.2.Fine cozinessAdvanced control syetems and reducer,high-quality drive chain and precision installasion process,ensure ... ProtectionMain Circuit Break ProtectionPrevent Not Operation Reversal ProtectionOver Speed, Speed Limit ProtectionStair Collapse And Roller Fracture ProtectionFault ...