Feature: Manual Roll Up Unit: The greenhouse film winding device is easy to use. When the temperature in the greenhouse rises, the winder can quickly and effectively release the wind, so that the temperature in the greenhouse can be reduced in time, which effectively reduces the loss caused by excessive temperature; the temperature suddenly drops, Can also be quickly and effectively heated by this film roll. Convenient: Easy to install and operate Precise pulley,anti-aging,easy to roll up greenhouse film,save the human resource Reliable performance: bidirectional self-locking High-quality chain,will not get rusty,long life cycle.Add the transition gear in the transmission system with more stead performance,Big speed ratio and output torque.