Features and Benefits: The new semi-automatic system: a new generation of semi-automatic gear reducer system. Quiet operation, synchronous connections, with left-open and right open type, open around the same type. Magnetic door terminal design, enabling normally open doors. (This device uses a high-density thick chassis rail timber disposable aluminum pump pressure molding, the standard configuration is 2 m.) Set of door configurations: 1, 2 reducer left and right reducer 3, normally open, magnetic 4 speed regulator 5, left spreader 6, reduction gear 7, 8 high-quality rail right spreader 9, stall doors positioning