Evoluent Mouse Vm4sw Verticalmouse 4 Small Wireless Retail Hand Orientation: Right Hand Maximum dpi: 2600 dpi Operating System Supported: Windows Downloadable driver for Windows XP, Vista and Win 7 in 32/64 bit for programming all 6 buttons. Mac Downloadable driver for programming 6 buttons. The driver is not required. VerticalMouse 4 still has basic functionality if the driver is not installed. Linux Basic functionality without a driver.