Trackball

Track Ball What is it?  A track ball is a pointing device. It is basically a mouse lying on its back. You can move the ball around with your thumb, your fingers, or the palm of your hand. Next to the track ball, there are up to three buttons, just like the left and right buttons you use on the computer mouse. Track balls are a bit easier to use than mouses. They do not take up space like a regular mouse, and you do not have to use a mouse pad with the track ball. Unlike the mouse, you can use it anywhere, including setting it on your lap. They are very popular for portable computers What is it used for? Track balls are used as a supplement or replacement for the standard computer mouse. It is an input device used to enter motion data computers or other electronic devices. Which type of impairment? Impaired upper limb mobility Cost:  $20.00 - $150.00    http://shopper.cnet.com/buy-trackball-mice/    Why do you think it is the best?  It is very easy for someone, anyone, to use. Also, it is not very big and doesn't take up a lot of space. Plus, you can use it anywhere.  This is a trackball that is on a laptop or portable computer keyboard.