1.can rotate in either clockwise or anti-clockwise and adopt a structure design . 2.have different ratio and torque and power multi-direction and integrated input and output shaft.it has feature of small volume,high laoding caability,wide power ranger,low noise,high efficiency,flexible in alternating directions.ratio:1, 1.5 ,2,2.5,3,4,5torque:0.015-3.378kn.mpower:0.015-335kw