Features: This CNC engraving machine controller is specially designed for 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. Integrated 21 function keys including emergency stop, cycle start, spindle on/off and so on. The exterior housing is water-resistant and can guarantee normal operation against dirty or oil. 12*12mm buttons ensure that your finger will not interfere with the adjacent buttons. Specifications: Compatibility: For only Connector: USB Size: 20.5*8*2.8/8.07*3.14*1.1in Package Includes: 1 x Controller