Onboard multiple connectors :CSI/DSI/FAN/HDMI/USB/RJ45 Gigabit Ethernet/Micro SD Card Slot/M.2 Slot. Compared with version B, version A has fewer functions.Without RTC, FAN controller and battery holder Precautions for Use 1: DO NOT unplug any devices other than HDMI and USB when powering on. 2: FAN only supports 5V, and NOT support 12V. Confirm the fan voltage before connecting. This version of the fan does not have a controller and cannot be adjusted in speed. 3: The DSI display interface is the DSI0 interface, and the DSI1 display interface is not connected. (V4 version starts to display interface for DSI1) 4: A type C interface can be used for the power supply or a USB SLAVE interface for programming images. 5: 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. 6: When CM4 is in normal use, it needs to provide 5V/2A power supply for CM4. Otherwise, it will occur automatic shutdown, frequency reduction, problem. 7: 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. 8: The module does not have any protection, please do not short-circuit the power supply. 9: USB2.0 is closed by default, if you need to open it, you need to add dtoverlay=dwc2,dr_mode=host. 10: When using HDMI1 alone, need to purchase HDMI Adapter separately. 11: Both USB 3/4 and HDMI1 need to be used, using USB HDMI Adapter to connect it out. 12: This board does not support the POE function. 13: M.2 interface power supply is limited to 1.5A, if it causes problems such as slowing down of solid state or other equipment, it is recommended to buy version B. Package Content CM4 IO BASE A x1 mounting screw x1 Online Development Resources /User Manual ://bit.ly/3QfJTh5

Note: USB2.0 is closed by default, if you need to open it, you need to add dtoverlay=dwc2,dr_mode=host. Note:DO NOT unplug any devices other than HDMI and USB when powering on. Suitable for evaluating the Raspberry Pi CM4 or being integrated into end products. Onboard multiple connectors : Onboard CSI/DSI/FAN/HDMI/USB/RJ45 Gigabit Ethernet/Micro SD Card Slot/M.2 Slot interfaces for easy use. Mini Base Board (A) with standard CM4 socket and color-coded Raspberry Pi 40PIN GPIO header. Compatible with Raspberry Pi Compute Module 4 Lite/eMMC series modul.