... ,low power consumption 2.High microstep,high torque 3.broad voltae range 4.wide output current range:0.3-8V Characteristics:1. ... 1/2,1/4,1/8,1/16,1/32,1/64,1/128,1/2561/5,1/10,1/25,1/50 ... motor free .NOTE:1, When ambient temperature is high or working current over 2.7A, fix the module on big metal shell ... has a jump5,installation dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price