Features: High-performance 32-bit 64MHz ARM Cortex-M0+ series STM32G0B1VET6 MCU Onboard BOOT button to enable DFU mode – for bootloader updates. Thermistor circuit is protected to prevent MCU damage from short-circuited heated bed and heater cartridge connection. Four 2-pin fan ports, one always-on fan port, and two 4-pin fan ports. All fans can realize VIN12V, 5V voltage selection via jumpers, and different voltages can be set separately for different ports. Integrated SPI and UART mode TMC driver and DIAG pin, easily configurable with jumpers. Supports power fail recovery, filament-runout sensor, auto-shutdown, BLTouch, proximity switch, RGB, etc. Built-in CAN bus port. Built-in UART and I2C expansion ports. SPI expansion port is selectable at +3.3V and +5V, convenient for connecting expansion modules such as an ADXL345 accelerometer. Specifications: Item: SKRat V1.0 3D Printer Motherboard MCU: 32-bit 64MHz ARM Cortex-M0+ series STM32G0B1VET6 Built-in CAN Bus ADXL345 PT100 Supports ADXL345 VIN12V/5V With: 7 fan ports Compatible: RatOS 2.0 For Klipper 3D Printer Control Board Size: approx. 11x8.5cm/4.33x3.35inch Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!