This is a CM4 To Pi 4B Adapter---Compute Module 4 to Raspberry Pi 4 Model B Adapter, Based On Compute Module 4, Alternative Solution for Raspberry Pi 4B. Using Compute Module 4 to reproduce the Original appearance of Raspberry Pi 4. Note: Compute Module 4 is not included. Onboard standard CM4 connector, support access to CM4 Lite / eMMc series boards with Quad Core Cortex A72 64-bit processor, more powerful performance. Onboard 4-ch USB 3.0 ports, compatible with USB 2.0 / 1.1 transmission. Onboard RJ45 Gigabit Ethernet port, 10 / 100 / 1000 M adaptive. Onboard PoE header, for connecting PoE HATs. Compatible With Pi 4B Series HATs: Easy Access To Pi 4B Series HATs Or Other Development Projects USB Type C interface is for the power supply or can be used as the USB SLAVE interface for programming images. Do not connect to other devices when using the micro USB port to program the image for ensuring the power supply of Compute Module 4. CM4 must be provided by 5V 2A, or it will shut down, lower frequency, etc.