1.32-bit 64 MHz ARM -M0+ series STM32G0B1VET6 MCU. 2.Onboard BOOT button to enable DFU mode to update the bootloader. 3.The thermistor circuit is protected to prevent MCU damage from shorted heated bed and heater connection. 4.Four 2-pin fan ports, one always-on fan port, and two 4-pin fan ports. 5.All fans can realize VIN, 12V, 5V voltage selection via , and different voltages can be set separately for different ports. 6.Integrated SPI and UART mode of driver and DIAG pin, configurable with . 7.Supports power loss recovery, filament runout sensor, auto power-off, BLTouch, proximity switch, RGB, etc. 8.Onboard CAN bus port. 9.The SPI expansion port is +3.3V and +5V selectable, which is convenient to connect expansion modules, such as an ADXL345 accelerometer. 10.Onboard UART and I2C expansion output ports. Dimensions:110 x 85mm Mounting Size:110 x 85mm MCUARM -M0+ STM32G0B1VET6 Input VoltageDC12V-DC24V Logic VoltageDC 3.3V Heater ConnectionHeated Bed (HB), Heater (HE0, HE1) HB Port Max. Current10A Continuous, 15A Instantaneous Heater Max. Current8A Continuous, 10A Instantaneous Fan Port4 x CNC, 1 x Always On, 2 x 4-pin Header Fan Port Max. Current1A Continuous, 1.5A Instantaneous Overall Current(Heater +Drivers+All Fans)Less than 15A Expansion PortBLTouch (Servos, Probe), PS-ON, PWR-DET, Fil-DET, RGB, CAN-, SPI, UART, I2C Stepper Driver ModeSPI, UART, STEP/DIR Stepper Motor SocketX, Y, Z (Dual Z axes), E0, E1 5 channels in total Thermistor5 x NTC Ports, 1 x PT100/PT1000 Display2.4-inch TFT, 3.5-inch TFT, LCD12864 Screen PC ConnectionType-C Supported File FormatG-code: Recommended Slicer/ConsoleCura, Simplify3D, Pronterface, Repetier-host, Makerware Supported FirmwareMarlin, Klipper Colour:black Material: PCB+electronic components Package Contents: 1 x SKRat V1.0 32 Bit 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.