Contour Design RollerMouse Pro2, USB, Black, Microsoft Windows 8/7/Vista/XP/ME/98 Microsoft Windows 2008/2003/2000/NT 4.0 Apple OSX, Apple..., 510 mm, 90 mm, 32 mm Contour Design RollerMouse Pro2. Interface: USB, Product colour: Black. Compatible operating systems: Microsoft Windows 8/7/Vista/XP/ME/98 Microsoft Windows 2008/2003/2000/NT 4.0 Apple OSX, Apple.... Width: 510 mm, Depth: 90 mm, Height: 32 mm http://www.computeractive.co.uk/ca/review/1915845/roller-mouse-pro2 We looked at the Roller Mouse Free a few months ago – it’s a replacement for your mouse, which sits below the keyboard and is designed to combat the injuries that can result from computer use.Largely, this means repetitive strain injury (RSI), a condit... Much better control than a mouse, once you get used to it; handy shortcut buttons, Expensive A superb, comfortable alternative to the old-fashioned mouse... http://www.computeractive.co.uk/ca/review/1915845/roller-mouse-pro2 We looked at the Roller Mouse Free a few months ago – it’s a replacement for your mouse, which sits below the keyboard and is designed to combat the injuries that can result from computer use.Largely, this means repetitive strain injury (RSI), a condit... Much better control than a mouse, once you get used to it; handy shortcut buttons Expensive A superb, comfortable alternative to the old-fashioned mouse Good points Much better control than a mouse, once you get used to it; handy shortcut buttons Bad points Expensive ...