CNC Mach3 4 Axis USB HandWheel Pulse 50PPR Optical Encoder Generator MPG Pendant Work for Mach3, All the buttons can be programmable support 4 axis. the 4th axis- A axis, no A=0 function ( A axis functions are not as much as the other 3 axis) About the hand wheel, you move slow, the machine runs slow; also you move fast, the machine runs fast. Rich real-time display of large screen LCD; display machine status,run,pause,idle,step value display X y Z axis workplace coordinate and x y z axis machine coordinate; show the feed rate,spindle speed