... .High performace,low power consumption 2.High microstep,high torque 3.broad voltae range 4.wide output current range:0. ... ~50VDC2.Output current:1.3A-4.5A3.Mircostepping:1(1.8º),1/2,1/4,1/8,1/16,1/ ... , When ambient temperature is high or working current over 2.7A, fix the module on big metal shell , ... make the module run reliably for a long time.2, Half current automatically: if control machine not send ...