... +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free .NOTE ... temperature is high or working current over 2.7A, fix the module on big metal shell , or use axle flows ... second, driver enter half current state of automatically for electricity saving, the phase current of the winding ... motor driver,1.3A-4.5A,high quality and reasonable price