1. Upgrade the shell: reduce the of being damaged during transportation and reduce short circuit problems. 2. Upgraded power button switch, this switch only controls the power signal, no current flows. 3. module is cancelled, and the driver integrates 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 will be automatically recognized. 6. 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 axis); lasergrbl. System support: Windows XP; 7/8/10. Stepping motor: Support 24V 2A. Spindle motor: support 24V 10A (support PWM0%-100%). Offline control: support gcode, , tap, nc, ncc, and other formats to process files. Engraving machine suitable for this control panel: 3018pro-METAL engraving machine 3018 pro machine 1610 DIY machine 3018 Pro Max engraving machine 2418 DIY engraving machine Colour: white + black Material: plastic Package Contents: 1 x GRBL control board 1 x SD adapter 1 x TF card 1 x connection line 1 x manual Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.