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Trackballs
Track Balls or also called "rollerball" are best described if you turned the traditional mouse over exposing the ball. Trackballs are a stationary device. Movement or rotation of the ball moves the cursor.
The traditional mouse requires that the user to perform three tasks at once. The user must grasp the mouse, move the mouse, and click a mouse button at the same time.
By design, the trackball allows for the user to perform each of these tasks seperatly of one another.
The size of ball of trackball will vary from as large as a cue ball, to as small as a marble. The smaller the ball, the less amount of effort or rotation of the ball.
Buttons on the trackball can be a single click, right click, double click, or drag-lock.
Some trackballs are plug and play, and require no installation other than the connecting of a cable to the computer's port. While other trackballs have supporting software to be installed in the computer. The software allows for customizing the acceleration of the mouse and assigning different functions to trackball's buttons.
The BIGtrack has a 3 inch trackball which makes it the largest  trackball available. The large ball requires less fine motor control than a standard trackball BIGtrack is ruggedly built. It has a left and a right mouse click button located behind the trackball to avoid unwanted mouse clicks. The BIGtrack also allows for 2nd Mouse Connection both the BIGtrack and a second mouse can be connected allowing simultaneous participation. The bright large 3 inch trackball helps to make mouse movements easy and accurate. While the oversized buttons make mouse clicks simple for those with poor motor control. For even more access the BIGtrack is available in a switch adapted version.
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