The Contour Roller Mouse Red with its solid, sleek and durable aluminum frame, houses a new advanced rollerbar and eight centralized button functions. Seven sensors inside the rollerbar automatically track cursor position, constantly adjusting speed and acceleration to ensure the rollerbar is as central as possible, and adapting to your pace of work to decrease micromovements and increase efficiency. The new textured and thicker rollerbar offers better feel for increased control and strain. The larger surface of the rollerbar gives you more control when pointing, rolling or clicking. RollerMouse Red was designed to adapt to the diverse needs of today’s computer users, working with programs ranging from CAD to general Office applications. The mechanical mouse click has been replaced with an electronic click to eliminate click trauma and reduce the risk of unnecessary strain. The Contour Roller Mouse Red is controlled by a fully open rollerbar, which encourages the use of both hands Eight key functions made for productivity and ergonomics, including the “one touch” double click, copy and paste Keyboard risers making it possible to adjust keyboard height and angle to ensure optimal comfort and working position. The Contour Roller Mouse Red is compatible with Apple OSX, Apple Mac OS 8.1 or newer, Microsoft Windows 8/7/Vista/XP/ME/98 With RollerMouse Red Plus you have all the benefits of the RollerMouse Red with the addition of an extended, leatherette wrist rest.