1.High performace,low power consumption 2.High microstep,high torque 3.broad voltae range 4.wide output ... .Weight:<300g.7.Working environment:Temperature-15~40°C Humidity<90%.I/O Ports:1, VCC+:DC power positive poleNote ... so as not to damage the module2,GND:DC power cathode3,A+,A-:Stepping motor one winding4,B+,B ... ,installation dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price