This product is a Raspberry Pi Zero 2 W to 3B expansion board, which is the same size as the Raspberry Pi 3B.Gold-plated thimbles for power supply and communication do not occupy the GPIO pins of the Raspberry Pi; connect the Zero/Zero2 W's USB OTG to the expansion board through the gold-plated thimbles.Extend one 10/100Mbps Ethernet and 3 USB 2.0 host ports through USB HUB (note that the double-layer USB on the right side shares a set of USB signals and cannot be used at the same time).Onboard -USB power supply interface, compatible with Raspberry Pi 3B. It can be powered by this -USB, and the Raspberry Pi Zero does not need to be powered.Aluminum alloy shell is more conducive to heat dissipation, is not easy to rust, fits the size, and does not hurt the motherboardInterface: 3 x USB2.0Material:PCB+Aluminum alloycolour:Purple + BlackPackage Contents:1 x Expansion Board1 x Aluminum Alloy ShellOnly the above package content, other products are not included.Note: Light 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.