Compact size: 155.3mm x 76.5mm - Based on STM32F446 180Mhz，all IOs can withstand 5V voltage - 8 TMC stepper drivers support, with Uart&SPI support - Improved TMC jumper settings again，simpler and easier - 28V input max，12V@5A DC-DC，5V@8A DC-DC (Especially for Raspberry Pi)，3.3V@0.8A LDO - Two car fuses for hot bed input and main power input - Limit switch socket 24V/5V/3.3V optional, ready for more other equipment, such as -inductive sensor, BL-Touch - XH2.54 connectors - 10x PWM capable power mosfet outputs (1 for HotBed, 3 for Heat-End, 3 for fans, 3 for RGB LED strip) - 3pin temperature header, you can use thermistor or thermocouple (requires AD597 module) - Up to 8 ways PWM fans (only use 1 extrueder and no 12V/24V RGB used )，2 ways RGB led(12V & 24V optional) ，1 way 5V-RGB led (NEO-PIXEL/WS2812) - RepRapDiscount SmartController compatible pin header on board - UART1-Raspberry Pi pin header (including 5V@8A power supply) - 2X4 PinHeader Out for SD Card moudle - Onboard micro-SD card - Type-C and Type-B USB connector optional - EXP1 & EXP2 have more multiplexing functions, such as USART, I2C, CAN - SD card & USB upload support