[Compatibility]Compatible with 3018, 3018 Max, 3020 Plus and 4540 series CNC engraving machines. [TFT Touch Screen]Compared with LCD screen, TFT touch screen has the advantages of high responsiveness, brightness and contrast, making the display effect close to that of a CRT monitor. [WIFI TRANSFER & SD CARD]Files can be transferred from computer to offline handheld controller via SD or Wifi network. [Advanced Usage]User-defined keys can be defined by NC files, such as tool setting commands and return to commands. [Convenient]This offline control can reduce the load on the computer for long-term engraving. CNC engraving machine, CNC control, offline GRBL control module with TFT touch screen, suitable for CNC 3018/3020/ 3040pro/ 4540, for metal cutting wood processing Colour: Material:Metal Package Contents: 1 set x cnc controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.