characteristic： 1、several tooths drive,ligh strengh and high credibility 2、the material of main parts is bearing steelo 3、litter inertia adapts reducer intvertering. 4、low noise high efficiency,single stage efficiency are more than92% 5、input shaft and output shaft in the same axis,small volume technical data ： input power： 40W-2200W output torque： 12N.m-250N.m transmission ratio： 9-87