... :1.DC power input type:24V~50VDC2.Output current:1.3A-4.5A3.Mircostepping:1(1.8º),1/2,1/4 ... for a long time.2, Half current automatically: if control machine not send out signal in half second, driver enter half ... driver has a jump5,installation dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price