The 39038 Goobay USB 3.0 to Fast Ethernet Adapter is an Ethernet adapter designed to provide a fast and reliable data connection for mobile and home users. It features a USB 3.0 A plug, RJ45 socket, and integrated Fast Ethernet controller, allowing users to connect their laptop or desktop computer to an Ethernet network quickly and easily. The adapter is compatible with Windows, Mac, and Linux systems, and provides transfer speeds of up to 100 Mbps. Additionally, the adapter is compact and lightweight, making it perfect for carrying in a laptop bag or briefcase.