Contour Design RollerMouse Pro2, USB Type-A, 1250 DPI, White Contour Design RollerMouse Pro2. Device interface: USB Type-A, Movement resolution: 1250 DPI, Buttons quantity: 7, Scroll type: Wheel. Product color: White 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... 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 ...