The 133481 USB Hub and Gigabit Ethernet Combo Adapter allows you to connect to the internet easily through the built-in USB port on your laptop. This is an ideal solution for MacBook or other Windows computers that may have wireless built-in but don’t come with an Ethernet port. The adapter also combines a regular USB hub. So you can connect external USB peripherals, such as a MP3 player, digital camera, printer or pen drive.