Pi4B uses the same board frame and interface as Raspberry-Pi 4B; the combination of CB1 and Pi4B, the performance is almost close to Raspberry-Pi 3B, and can be an alternative to Raspberry*Pi 3B ^^ The combination of Pi4B+CB1 has high product cost performance and can become a low-cost choice for 3D printer users who use ordinary motherboards to run Klipper ^^ BIGTREETECH Pi4B is equipped with Gigabit Ethernet interface, HDMI0 interface, HDMI1 interface, CAM interface, CSI interface; 40Pin double-row pin header with the same function as Raspberry-Pi ^^ BIGTREETECH CB1 reserves HDMI 2.0A display interface, supports 4K display; onboard USB 2.0 port, 100M Ethernet interface and supports WIFI transmission ^^ Because of the modular form, Pi4B and CM4 have high modularity, which is convenient for users to use DIY