Kensingtons’ follow on from the Trackball Expert..
“Your computing experience just got smoother, faster and easier with the Kensington SlimBlade™ Trackball. Choose navigation mode to control cursor and scrolling. Media mode controls volume, play/pause, stop, and track forward/backward, while view mode zooms in/out, and pans. And it does it all with the ball to put complete [...]

The good news for computer users searching for a Trackball optical mouse is that there are many good models available from different manufacturers giving you plenty to choose from. For example, Microsoft have a model called the “Microsoft Trackball Optical” and Kensington have the “orbit optical trackball” (links to these at the end of the [...]

Kensington make use of their Diamond Eye optical technology the Expert mouse. This gives the best possible cursor responsiveness and control. Surrounding the trackball is a rotating ring which can be used for scrolling up and down pages/documents. A useful feature, which in use feels more accurate than a traditional scroll wheel.
If you are after [...]