... .Low Noise,Reliable performance 20mm dc motor with gearbox,with planetary gearbox,Can be equipped with encoder 1.Widely used in robot,lock ... Torque: 20kg.cm5.Low noise,low current no spark6.electric motor with encoder,3-16 pulse signal7.Reduction Ratio:3-10008.size ... .101.000.870.343.500.13 GM20-180SH,gear motor,electric motor