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 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, easily 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 (), Heater (HE0, HE1) 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, -DET, RGB, CAN-, SPI, UART, I2C Stepper Driver ModeSPI, UART, STEP/DIR 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.