[Touch Screen LCD Design] The GRBL offline controller features an easy-to-read 2.8-inch touch screen display for intuitive operation. The touch interface simplifies control of the engraving machine without requiring a connected computer. [Strong Compatibility] Compatible with common DIY CNC router models, including 3018, 3020, and 4540 series. [SD Card Support] Includes an SD card with sample files for testing. Supports G-code file loading and execution directly from the SD card. Functions independently, replicating core capabilities of standard computer-based CNC control software. [Computer-Free Operation] Enables standalone carving — no computer connection required. Load G-code files onto the SD card and operate the machine anytime, ideal for extended or portable use. [Simple Touch Control] Designed for direct touch interaction — start, pause, jog, and control machine functions with on-screen buttons. Color: Black Material: PCB Package Contents: 1 x Offline Controller Note: Actual product color may vary slightly due to screen settings and lighting conditions. Dimensions are subject to a tolerance of ±1–3 cm.