Overview CM4-IO-BASE-B + USB HDMI Adapter, for Raspberry Pi Compute Module 4, More USB And HDMI Connectors Via FFC Notes about CM4-IO-BASE-B 1. This model only support 5V fan and cannot work with the 12V fan. Please confirm the fan voltage before connecting. 2. The DSI Display Port is connecting the DSI0 interface of the CM4, and doesn't use the DSI1 display interface. 3. The Type C interface can be used for power supply or USB SLAVE interface for burning the image. 4. In order to ensure the normal power supply of CM4, please do not connect other devices when using the Type C interface to burn the image. 5. It needs to use a 5V 2A power supply for CM4. Otherwise, problems such as automatic shutdown, frequency reduction, etc. may occur. 6. When using the M.2 interface, please use the matching screws. Using screws of other lengths may cause the CM4 core to be damaged by the screws. 7. The module doesn't have any protection circuit, please do not short-circuit the power supply. 8. USB2.0 is closed by default, if you need to open it, you need to add dtoverlay=dwc2,dr_mode=host in config.txt. 9. HDMI1 uses a flat cable output, if you need to use it, you can purchase an HDMI adapter. 10. This expansion board does not support POE function. Package Content CM4-IO-BASE-B x1 USB HDMI Adapter x1 FFC cable 6PIN 1.0 pitch 60mm x1 FFC cable 20PIN 0.5 pitch 60mm x1 USB-A to USB-C cable 1m x1 Mounting screw x1 Note Development Resources and Technical Support are provided, please feel free to contact us if you have any problem!