... 1/32,1/64,1/128,1/2561/5,1/10,1/25,1/50,1/125,1/2504.Protect ... Stepping pulse input+5V (Rising edge effective , rising edge duration >10μS)6,DIR +,DIR-:Stepping motor direction input, voltage level ... use axle flows fan dispels the heat, to make the module run reliably for a long time.2, Half current ... jump5,installation dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price