... .3A-4.5A3.Mircostepping:1(1.8º),1/2,1/4,1/8,1/16,1/32,1/64 ... +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free .NOTE:1 ... shell , or use axle flows fan dispels the heat, to make the module run reliably for a long ... Pulse choice:In the driver has a jump5,installation dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price