... High microstep,high torque 3.broad voltae range 4.wide output current range:0.3-8V Characteristics:1.DC power input type ... ,DIR +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free ... .NOTE:1, When ambient temperature is high or working current over 2.7A, fix the module ... motor driver,1.3A-4.5A,high quality and reasonable price