Fangrui Product Details Cm4 Socket:suitable For All Variants Of Compute Module 4 Micro-sd Card Slot:for Connecting A Micro-sd Card With Pre-burnt Image (lite Variant Only) 40pin Gpio Header:for Connecting Sorts Of Hats Gigabit Ethernet Rj45 Connector:power Supply / Programming,5v Power Supply, Or Used For Emmc Burning,3.5mm Audio Jack User Button:usb2.0 Connector,for Connecting Sorts Of Usb Devices Connector:mipi Camera Interface Connector:mipi Display Interface Mp1658:mini Connector,supports 4k 30fps Output Boot Switch: On: Switch Usb To Type C Interface, Enter Download Mode When Powered On (configured As A Large-capacity Disk Through Rpi Boot) Off: Switch Usb To Type A Interface, Not Enter Download Mode When Powered On (booted From Emmc Or Micro-sd Card) Colour:as Shown Material:pc Due To Different Batches, There May Be Differences In Product Appearance And Printed Text, Which Not Affect Use Package Contents: 1 * Cm4-nano-b(gpio Not Soldered) 1 * 2 X 20pin Header Only The Above Package Content, Other Products Are Not Inc