Visit Amazon.com : http://www.amazon.com/gp/product/B00009KH63?tag=thefatkidin06-20<br /><br />Kensington Expert Trackball Mouse<br /><br />Large ball Trackball Mouse with Scroll Ring for comfort and precision <br />Customizable 4-Button design via TrackballWorks software <br />Compatible with Windows including Windows 8 and Mac OS Computers
