Features: brand new and high quality Driver working mode: SPI, UART, STEP/DIR. Fan interface: Three CNC fans, two frequent fans, CNC fan voltage optional expansion interface: Servo, probe, PS-ON, PWR-DET, Fil-DET, RGB, CAN FD. Heating interface: hot bed (HB), heating cable (E0, E1). Motor drive interface: X, Y, Z (dual Z axis), E0, E1, bottom bracket. Motor driver: TMC5160, TMC2209, TMC2225, TMC2226, TMC2208, TMC2130, ST820, LV8729, DRV8825, A4988, etc. Specifications: Material: PCB Color: As the Picture Shows Product Dimension: approx. 11x8.5cm/4.33x3.35inches Net Weight: 300g/0.66lbs Package Includes: 1Set SKR 3 Motherboard 3D Printer Control Board note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.