... .High microstep,high torque 3.broad voltae range 4.wide output current range:0.3-8V Characteristics ... the heat, to make the module run reliably for a long time.2, Half current automatically: if ... second, driver enter half current state of automatically for electricity saving, the phase current of the winding ... installation dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price