... low power consumption 2.High microstep,high torque 3.broad voltae range 4.wide output current range:0.3-8V ... +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free .NOTE ... , to make the module run reliably for a long time.2, Half current automatically: if control machine ... Stepping motor driver,1.3A-4.5A,high quality and reasonable price