1. Onboard standard CM4 connector, support access to CM4 Lite/eMMC series motherboards, quad-core A72 64-bit processor, more performance2. The interface position is easily compatible with the motherboard for 3B series (3B/3B+)3. Onboard USB audio headphone 4. Onboard 4-way USB expansion port, compatible with USB2.0/1.1 transmission5. Onboard RJ45 Gigabit Ethernet port, 10/100/1000M adaptive. Onboard PoE pins, support access to expansion boards with PoE functionSpecification:Product name: CM4 to 3B expansion boardInterface: 1*-compatible interface, 1* display interface, 1*CSI camera interface, 1*Gigabit Ethernet port, 4*USB interface, 1*3.5mm headphone Applicable products: for 3B/3B+Product size: 85 x 56mmMaterial: PCB+Metalcolour: bluePackage Contents:1 x CM4 to 3B expansion boardOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.