it can drive three axis, The 4th axis expansion, to facilitate your needs 4-axis machining when working Spindle relay output, easy to use software such as mach3 to control spindle start and stop. Semi-flow control functions, and effective to stop the motor when the current is reduced to a minimum. Interface with a fan, you can add fan under your choice. With 3 wire 0.8-3.5A (peak) rated output of two-phase adjustable-current bipolar stepper motor drive; Standard parallel port interface, support for MACH2, KCAM4 series software; With optical isolation and DCDC power supply isolation, the full protection of your computer parallel port and equipment; with limit switch, can connection 4 aixs limit switch Support four micro stepping 1, 1/2, 1/8 ,1/16; 12-36V single switching power supply, microchips to use as a 5V power supply, stable and heat small Using RC + 7414 automatic semi-flow, the current automatic reduce when stepper motor stop to down the heat WHAT’S IN THE PACKAGE 1x 3-Axis TB6560 Stepper Motor Driver board 1x DB25 parallel cable 3x Link Terminal