The large ball requires less fine motor control than a standard trackball and it is ruggedly built.
It has a left and a right mouse click button located behind the trackball to avoid unwanted mouse clicks.
The bright, large 3" trackball helps to make mouse movements easy and accurate, while the oversized buttons make mouse clicks simple for those with poor motor control. Fine motor control is not required - a swipe at the ball and a thump on the buttons works just as well
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