Connection: USB (USB-CH340) Software: GRBL controller, Universal Gcode Sender Master chip: 328P (for nano) Stepper motor driver: A4988 Laser engraving: Support Spindle drive chip: MOSFET, the highest 60V (recommendation within 48V, current :within 10A ) Support stepper motor: 12V, maximum current of 2A or less is recommended within 1.5A and additional heat. (Any stepper motor 42, 57) Specification of offline controller: Z+ and Z- , the Z move up and down. X+ and X- , the X move left and right. Y+ and Y- , the Y move Front and Back. : Spindle on (Laser on), Spindle off (laser off) SMOD: return Z+ for 5 seconds, change the Language to English. SD card: Included, you need a SD card reader to write into the root directory G-code files. Note Not every engraving machine can use our control panel, it is a matter of compatibility. Colour:As Shown Material:plastic Package Contents: 1 x cnc controller board 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.