[Touch screen LCD design] The GRBL offline controller with touch screen LCD has an easy-to-read 2.8 inch touch screen display, which is easy to operate. The touch screen control design of offline machine can make the control of engraving machine more simple and convenient. [Strong compatibility] offline controller is compatible with 3018/3020/4540 DIY router series. [Use SD card to and access files] The SD card includes some files for testing. The function of the touch screen offline machine is the same as the control software of the computer. You can also control action of the engraving machine as if you were operating at the top of the engraving machine. [Free your computer ] This touchscreen offline controller can more carry out carving work, because it can free your computer, especially in long-term carving work. You can operate the engraving machine successfully and without connecting the computer. As long as you put the items you need in the SD card, you can operate the engraving machine at any time. [Just click to control] The offline controller of the touch screen of the router can be used as control software to control the engraving machine. You only need to click the offline controller by hand to operate, which is simple and saves time. Color: black Material: pcb Package Contents: 1 x Offline 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.