Features: 1x RJ45 10/100M port, based on the RTL8152B Ethernet chip. Introduction to interface3x USB ports, for USB2.0/1.1. Micro HDMI-compatible to 3B HDMI-compatible port. Now we give another option which use a zero to replace 3B with this adapter. The height of 20x2 GPIO Pins will not change . You can use GPIO expansion board perfectly. When the official factory stop to product 3B, Some old project have to change to use 4B. With the unique design , you can make your zero with same USB/HDMI-compatible/RJ45 port. Work at zero also can work at a computer/Android phone with micro usb/3B/4B or other mini computer with a micro usb cable. brand new and high quality The Zero to 3B interface adapter with USB hub and RJ45 10/100M port ,which is designed refer to the 3B size. Specifications: Material:PCB Interface: 4 USB Port, 3 USB + 1 RJ45 Port (optional) Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1Set x Expansion Board