[Product]3 Axis GRBL Offline Controller Hand Control [Support SDTF card]Support SD card and TF card at the same time [Feature]With this offline controller module, you can directly control the CNC router without connecting it to your computer. After inserting the file into the SD card,the engraving file can be directly identified. You can also use the -USB cable to connect the offline hand controller board to your computer and save the file directly. [Easy to use Wide application]All you have to do is connect the offline module to the GRBL controller board, which you can use it to control the CNC rounter; It supports our 3018 pro , Colour:As Shown Material:plastic Package Contents: 1 x offline hand controller board 1 x cable 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.