Fangrui Product Details This Control Board Is A 32-bit Mcu Control Board, Which Runs Faster, The Maximum No-load Speed Reaches 40000mm or min, The Algorithm Is Optimized Better, The Vibration Of The Machine Is Smaller When The Machine Moves At High Speed, And The Performance Is More Stable Using The Type-c Usb Interface, It Is More Convenient To Use And The Data Mission Is More Stable Support External Drive, The Reserved Interface For External Drive Is Consistent With The High-power Drives On The Market, Which Is Convenient For Wiring The Control Board Power Supply And Line Number Circuit Are Isolated By Optocoupler, The Whole Control Board Is And More Stable Y- Dual Drive, Stronger Drive Capability support Usb Automatic Identification. When Plugged In Usb And Connected To The Computer, It Automatically Shield The Offline Interface To Avoid Offline Interference With Data. At The Same Time, It Supports External Buttons, Which Can Switch Offline or usb Control With One Key There Are Long Strip-shaped Mounting Holes On The Shell, Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.