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No need additional driver or external power supply required The usb self-check light, you can type the " scroll" on the keyboard to activate it. The X,Y,Z ,A buttons need setup the "HOTKEY" in the MACH3, the other buttons can work directly. USB 2.0 Cable, Max 3 meter length Directional motion control: X+,X-,Y+,Y-,Z+,Z-,A+,A- Feed rate control: F+,F- Jog rate: J+,J- Spindle speed: speed up, slow down Programming: E-stop,cycle start,spindle on/off,Redo,single step,original point Dimensions: 22 x 8 x 3cm Please note this item works with Mach 3 ONLY Package Includes 1 x MACH3 4 Axix CNC Pendant