Safety: The world's leading braking system with friction transmission against overload Energy-saving: Intelligent frequency conversion more energy-efficient, quieter operation Reliable: Phase sequence without dislocation system, fault code display and automatic protection Humanization: Adjust able height of the flashlight door Higher efficiency: Lifting speed is higher, more effectivethan 1: 6 ~ 1: 8 More secure: DF63 models with hoisting chain redundancy design, double security