1. Onboard standard CM4 connector, support access to CM4 Lite/eMMC series motherboards, -core A72 64-bit processor, more powerful performance 2. The interface position is easily compatible with the motherboard for Raspberry 3B series (3B/3B+) 3. Onboard USB audio headphone 4. Onboard 4-way USB expansion port, compatible with USB2.0/1.1 transmission 5. Onboard RJ45 Gigabit Ethernet port, 10/100/1000M adaptive. Onboard PoE pins, support access to expansion boards with PoE function Specification: Product name: CM4 to 3B expansion board Interface: 1*-compatible interface, 1* display interface, 1*CSI camera interface, 1*Gigabit Ethernet port, 4*USB interface, 1*3.5mm headphone Applicable : for Raspberry 3B/3B+ Product size: 85 x 56mm Material: PCB+Metal colour: blue Package Contents: 1 x CM4 to 3B expansion board Only the above package content, other are not included. Note: Light 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.