1. The onboard standard CM4 connector supports access to the CM4 Lite/eMMC series motherboard, and the core A72 64 bit processor has more performance 2. Easy interface location compatible with 4B motherboard for raspberry pie 3. On board 4-way USB 3.0 expansion port, compatible with USB 2.0/1.1 transmission 4. On board RJ45 Gigabit Ethernet port, 10/100/1000 M adaptive 5. On board PoE pin, supporting access to expansion board with PoE function Product name: CM4 to Pi4B expansion board+CM4 core board CM4 capacity: WIFI 1G+8G Interface: 1 gigabit network interface, 4 * USB3.0 interface, 1 USB-C power interface, 2 * --compatible interface Voltage: 5V/3A of application: for raspberry pie 4B motherboard, CM4 core board intended for: 1. that the TF card is not stable and needs a Pi4B with onboard eMMC function 2. 4-way USB3.0 is required, and 2.0 interface is slow 3. The application scenario needs a wide temperature range 4. The product is designed based on the 4B motherboard of for raspberry pie and needs to find an alternative Product size: 85 x 56mm Colour:blue+green Material:PCB+metal Package Contents: 1 x CM4 to Pi4 Adapter 1 x CM4 core board Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.