Extend a USB 3.0 port from the back of your computer to your desktop. The USB3SEXT5DKB Black Desktop USB 3.0 Extension Cable connects to an available USB female port on a Mac or PC computer, allowing you to relocate the USB (female) port up to 5-feet away from the computer case. By extending the USB 3.0 port away from the computer case, you can situate a USB 3.0 port from the computer in a more practical spot, such as on top of the computer case or on a desktop.