1. The onboard standard CM4 connector supports access to CM4 Lite/eMMC series motherboards, which has more powerful performance. Compatible with 4B Size and functions same as much as possible 2. Easy interface location compatible with 4B motherboard for raspberry pie 3. On board 4-way USB2.0 expansion port, compatible with USB 1.1 transmission 4. On board RJ45 Gigabit Ethernet port, 10/100/1000 M adaptive 5. On board GPIO audio headphone (capturing GPIO18 and GPIO19) 6. Camera and interface lead out 1 circuit respectively 7. Switch switching can support the start of Type C port burning system or CM4 system Product name: CM4 to PI4B adapter board Interfaces: USB * 4, RJ45 * 1, * 1, Micro--compatible * 2, TypeC power * 1, CM4 interface * 1,. SD card slot * 1, Camera and interface Board size: 86 x 56mm color:Green+black Material:PCB+metal Package Contents: 1 x CM4 to 4B expansion board 1 x Metal case kit(with fan) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.