This is a Kensington trackball. It works without any problems. I'm selling it because I'm replacing it with a different trackball. It has a scroll ring, which is very convenient for scrolling up and down. At first glance, there are no noticeable scratches or stains, but I think many people will feel that it has been used when they see it in person. The rest is as shown in the photos. There is no box or instruction manual, but it shouldn't be too difficult to use. Connection type...Wired