Product: 3 Axis GRBL Offline Controller Hand Control; With this offline controller module, you can directly control the CNC router without connecting it to your computer Manually Control:You can manually adjust X,Y,Z axis location as engraving starting point,manually open or close spindle,manully open or close cooling fan Support SD AND TF card: Support SD card and TF card at the same time,standard capacity 1G Function: After inserting the file into the SD card,the engraving file can be directly identified; You can also use the micro 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 1310, 1610, 3018, 3018 pro ,upgraded 3018 pro etc grbl control cnc machine, Manufacturer: Changzhou Rattm Motor Co.,Ltd