The motherboard uses a 32-bit coretx- core control unit, which has strong and stable performance, and rich functions The motherboard uses an open interface that can be freely matched with motor driver modules (A4988, DRV88225, LV8729, TMC2100, TMC2208, TMC225, TMC2226, TMC2209, and external drivers, etc.) to meet the needs of different customers. The motherboard has optimized the connection of limit switches and comprehensive circuit protection design Comes with print pause, print save, and power on resume functions. In case of unexpected power outage, power outage save resume, or shutdown after printing, additional functions are required. Model:3D Printer Board Application:3D printing Microprocessor:STM32 F4 Auto-leveling:Support Input voltage:8V-30V Mounting Hole Size:90mmx70mm Microprocessor: 32 Bit 168MHz CPU ARM - Master Chip: STM32F417VET6 Colour:As Shown Material:PCB Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 x 3D Printer 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.