Compact size: 177mm x 108mm STM32F407 default onbard,F446,H743,4x RP2040 10 stepper drivers support, 6x 3A/28V Max,4x 6A/60V Max Intelligent identification of driver type, automatic switching of UART/SPI channel 28V input max,12V@3A DC-DC,5V@3A DC-DC,5V@4A Isolated DC-DC ,Separate power supply circuit for stepper motor Three car fuses for hot bed input / main power input / Motor Power Input Limit switch socket 24V/5V/3.3V, ready for more other equipment, such as -inductive sensor, -Touch XH2.54 High temperature resistance connectors 12x PWM capable power mosfet outputs (1 for HotBed, 5 for Heat-End, 6 for fans) Up to 6 temperature sensors support Up to 6 ways PWM fans 5V-RGB led (NEO-PIXEL/WS2812/SK6812) RepRapDiscount SmartController compatible pin header on board(EXP1 & EXP2) UART/SPI connector (including Isolated 5V@4A power supply) Onboard -SD card Type-C USB connector EXP1 & EXP2 have more multiplexing functions, such as USART, I2C, CAN SD card & USB upload support A 4.7kOhm 0.1% temperature sensor pull up resistor is used, PT1000 can be connected directly. For PT100, an amplifier board must be used. 5000V digital isolation between all motor drive sockets and control core 3750V optocoupler isolation between all MOSFET outputs and the control core Model Number: Spider King Mother Board Item Type: Motherboard color:Black Material:plastic Package Contents: 1 x Motherboard 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.