Avoids forearm twisting for comfort and good health\n\nThe patented shape supports your hand in an upright neutral posture that generally avoids forearm twisting. Many users, including medical doctors, ergonomists and physical therapists, said the Evoluent VerticalMouse provides superior comfort and even relieved their wrist pain.\n\nComfortable and easy to use\n\nThe shape is thoughtfully sculpted for uncompromised comfort and easy-to-reach programmable buttons. No finger contortions are needed to operate the buttons.\n\nAdjustable optical sensor\n\nPointer speed controls on the side allow convenient adjustment without even releasing your grip from the mouse.\n\nImproved thumb rest\n\nThe thumb rest has been reshaped to provide even more comfort over earlier versions.\n\nPointer speed indicators\n\nTop mounted LEDs show through the chrome thumb rest to indicate selected pointer speed including extra low (XL), low (LO), MD (medium), to high (HI).\n\nNow two thumb buttons\n\nA new bottom thumb button provides greatly extended functionality when used with the included driver.\n\nMini Receiver\n\nThe tiny 2.4 GHz receiver avoids being knocked off the side of a notebook computer.\nExtended lip prevents rubbing\n\nAn extra wide lip along the bottom edge prevents the last finger from rubbing the desk.\n\nPowerful and intuitive driver\n\nEvoluent Mouse Manager for Windows provides extensive but easy to use functionality for 6 buttons through a simple and intuitive interface.