TestFreaks posted a review on the StarTech 15 ft USB 2.0 Active Extension Cable

Today for review I've got a simple device that allows us to essentially double the length we can go with our USB cables, it's simply called a 15 ft USB 2.0 Active Extension Cable, and it's from a company called StarTech. This is an active extension cable, though it does not require any additional power like some out there might. It's basically a very long single port USB hub, one end has the male USB interface while the other end has a small box with a female USB interface in it. The cable allows you to double the length of your USB cable simply and easily, and you can chain up to five of these cables together to really get some distance.

StarTech 15 ft USB 2.0 Active Extension Cable Review