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 85mmMounting Size:110 x 85mmMCUARM -M0+ STM32G0B1VET6Input VoltageDC12V-DC24VLogic VoltageDC 3.3VHeater ConnectionHeated Bed (), Heater (HE0, HE1) Port Max. Current10A Continuous, 15A InstantaneousHeater Max. Current8A Continuous, 10A InstantaneousFan Port4 x CNC, 1 x Always On, 2 x 4-pin HeaderFan Port Max. Current1A Continuous, 1.5A InstantaneousOverall Current(Heater +Drivers+All Fans)Less than 15AExpansion PortBLTouch (Servos, Probe), PS-ON, PWR-DET,-DET, RGB, CAN-, SPI, UART, I2CStepper Driver ModeSPI, UART, STEP/DIR SocketX, Y, Z (Dual Z axes), E0, E1 5 channels in totalThermistor5 x NTC Ports, 1 x PT100/PT1000Display2.4-inch TFT, 3.5-inch TFT, LCD12864 ScreenPC ConnectionType-CSupported File FormatG-code: Recommended Slicer/ConsoleCura, Simplify3D, Pronterface, Repetier-, MakerwareSupported FirmwareMarlin, KlipperColour:blackMaterial: PCB+electronic componentsPackage Contents:1 x SKRat V1.0 32 Bit MotherboardOnly 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.