1.Provide online user manual, please check the manual carefully before using! CM4-DUAL-ETH-MINI, a baseboard that can be used with Raspberry Pi Compute Module 4. 2.Do not plug or unplug any device other than a USB while it is powered on. Confirm the fan voltage before connecting, only 5V fans are supported.USB2.0 is closed by default, if you want to open it, you need to add 'dtoverlay=dwc2, dr_mode=host in config.txt'. 3.Supports 5V DC Type-C interface power supply, and features dual Gigabit Ethernet ports, single-channel USB2.0 with a fan interface and standard Raspberry Pi 40Pin interface, which is suitable for scenarios requiring multiple network ports such as soft routing. 4.The Type C interface can be used as a power supply or as a USB interface to program the image (need to use the DIP switch to switch). For ensuring the normal power supply for CM4, please do not connect other devices when using the Type C interface to program the image.