POINTER SPEED INDICATORS: Top mounted LEDs show through the chrome thumb rest to indicate selected pointer speed. Do not use on reflective or clear surfaces as pointer might skip. IMPROVED THUMB REST: The thumb rest has been reshaped to provide even more comfort over earlier versions. COMFORTABLE AND EASY TO USE: The shape is thoughtfully sculpted for uncompromising comfort and easy-to-reach programmable buttons. POWERFUL AND INTUITIVE DRIVER: Evoluent Mouse Manager provides extensive but easy to use functionality for 6 buttons through a simple and intuitive interface. HARDWARE COMPATIBILITY: VerticalMouse is plug-n-play compatible with all operating systems that support USB. Basic button and wheel functions work without additional drivers. SOFTWARE COMPATIBILITY: VerticalMouse comes with Mouse Manager software for customizing the buttons. Mouse Manager is compatible with: Windows 7 and 10 Mac OS 10.5 to 10.14 (update for 10.15 is under development. Third party software may be used in place of Mouse Manager for OS 10.15.)