Extend a usb port from the back of your computer to your desktop the usbextaa5dsk desktop usb 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 ft away from the computer case by extending the usb port away from the computer case you can situate a usb port in a more practical spot such as on top of the computer case or on a desktop usb thumb drives or other external usb storage the desktop usb extensio