1. Upgrade the shell: reduce the chance of being during transportation and reduce short circuit problems. 2. Upgraded power button switch, this switch only controls the power signal, no large current flows. 3. module is cancelled, and the stepper motor driver integrates its own short-circuit protection and heat dissipation aluminum alloy, without Now worry about module damage. 4. The fan is upgraded to increase heat dissipation. 5. The offline recognition function is added, and the offline module and the computer can be inserted at the same time. Computer control be automatically recognized. Upgrade the spindle drive to support spindles up to 20,000 rpm, and now supports high-power spindles. Model: V3.4. Control system: GRBL. Power input: DC 24V (12-24). Support software: grblcontrol / candle (3 ); lasergrbl. System support: XP; 7/8/10. Stepping motor: Support 24V 2A. Spindle motor: support 24V 10A (support PWM0%-100%). Offline control: support gcode, , tap, nc, ncc, cnc and other formats to process files. Engraving machine suitable for this control panel: 3018pro-METAL engraving machine CNC 3018 pro machine CNC 1610 DIY machine CNC 3018 Pro Max engraving machine CNC 2418 DIY engraving machine Colour: white + black Material: plastic Package Contents: 2 x GRBL control board 2 x SD adapter 2 x TF card 2 x connection line 2 x user manual 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.