Features: This kit includes SKR Mini E3 V3.0, CB1 V2.2, Pi4B Adapter, which perfect fit for ender3 series and voron series 3d printers to run klipper firmware. SKR Mini E3V3.0 adopts latest STMicroelectronicsG0 series main control chip STM32G0B1RET6 or STM32G0B0RET6; Support Reserves 3CNC fan interfaces, increase the heat dissipation controllable fan to reduce the printer temperature when the device is working. The PC communication USB interface of SKR Mini E3V3.0 silentboard is upgraded from MiniUSB to MicroUSB, which is more adaptable; Increase SPIoutput port +3.3V power supply, external SPIsensor power supply voltage+3.3V and +5V are optional, support the motherboard to directly supply power to peripherals. The combination of CB1+Pi4B has high product cost and can become a low-cost choice for 3D printer users who use ordinary Specifications: Item：SKR Mini E3 V3.0, CB1 V2.2, Pi4B Adapter kit Chip:SKR Mini E3 V3.0 adopts STMicroelectronicsG0 series main control chip STM32G0B1RET6 or STM32G0B0RET6 Interface：MicroUSB Pi4B Equipped with：GigabitEthernet interface,+HDMI0 interface, HDMI1 interface, CAMinterface, CSIinterface; 40Pin double-row pin header with the same function asRaspberryPi. Package Includes: 1 Set SKR Mini E3 V3.0 +CB1 V2.2 +Pi4B Adapter Kit note: Transition: 1cm=10mm=0.39inch 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!