Evoluent VM4RM VerticalMouse 4 Right Hand Ergonomic Mouse with Bluetooth Connection for Mac OS (Regular Size) Bluetooth connectivity Includes Mac OS X driver for programming 6 buttons. The driver is not required. VerticalMouse 4 still has basic functionality without the driver. Warranty 2 Years The shape is thoughtfully sculpted for uncompromised comfort and easy-to-reach programmable buttons. No finger contortions are needed to operate the buttons. The thumb rest has been reshaped to provide even more comfort over earlier versions.