... .Output current:1.3A-4.5A3.Mircostepping:1(1.8º),1/2,1/4,1/8,1/16,1/32,1/64,1/128,1/2561/5,1/10,1/25,1/50,1/125,1/2504 ... (Rising edge effective , rising edge duration >10μS)6,DIR +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low ... choice:In the driver has a jump5,installation dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price