Features: This CNC engraving machine controller is specially designed for Mach3 system. Easy to use, no need to install any software or drive, connected by USB port and the cable can be stretched to about 3 meters. The controller has all commonly used functions for Mach operation, and can move both axles simultaneously. Integrated function keys including emergency stop, cycle start, spindle on/off and so on. 12*12mm buttons ensure that your finger will not interfere with the adjacent buttons. Specifications: Compatibility: For Mach3 only Connector: USB Size:Approx. 22.2 x 8 x 5.6cm/8.7 x 3.1 x 2.2in Package Includes: 1 x ControllerNote:Please note that the color of the button will be sent randomly, and make sure you will not mind before ordering.