GRBL Control Board:Connection: USB (USB-CH340)Software: GRBL controller, UniversalGcodeSenderMaster chip: 328P ( nano)driver: A4988 Material: pcbColor: as shownSpindle drive chip: MOSFET, the highest 60V (recommendation within 48V, current :within 10A )Support : 12V, maximum current of 2A or less is recommended within 1.5A and additional heat. (Any 42, 57)Laser-engraving: Support Offline Controller:1: Manual control: Manually adjust the position of the three axes of as the starting point of engraving, manually open or the spindle.2: Document engraving: After the offline board is saved in the file, it can be connected to the GRBL control board for engraving, no need to connect to the computer.3: Storage file: The offline version is connected to the computer and recognized as a USB storage device, which can directly access the engraving file.Offline Controller Operate:Press X+ and X- , the X axis will move left and right.Press Y+ and Y- , the Y axis will move Front and Back.Press SPIN: Spindle on (Laser-on), Spindle off (Laser-off)'Press Exit/Step: return and change . Package Contents:1 x 2 Axis Controller Only the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.