[Product] 3-axis GRBL Offline Controller Handheld Controller [Support SD/TF Card] Supports SD card and TF card simultaneously. [Function] With this offline control module, you can directly control your CNC router without connecting it to your computer. After inserting the file into the SD card, the engraving file can be identified directly. You can also use the mini-USB cable to connect the offline controller to your computer and save the file directly. [Easy to Use & Wide Application] All you need to do is connect the offline module to the GRBL control board, and you can use it to control your CNC router. It supports our 3018 pro. Color: As Shown Material: Plastic Package Contents: 1 x Offline Handheld Controller 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 to be slightly different from the real thing. The allowable measurement error is +/- 1-3 cm.