... 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 ... metal shell , or use axle flows fan dispels the heat, to make the module run reliably for a long ... dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price