Are you experiencing pain or discomfort in your mousing wrist after a long day sitting in front of the computer? Or simply tire of using the traditional grip on your clunky or too tiny uncomfortably old mouse? Now you can relax your hand with this vertical ergonomic optical mouse thats designed to reduce strain and fatigue resulting from forearm twisting and help prevent repetitive stress and pain. The vertical “handshake” position encourages a neutral wrist and arm alignment instead of a twisted arm position. The ergonomically-designed grip and thumb rest fit the contour of your palm to provide maximum comfort so no finger contortions are needed to operate the 5 easy-to-reach buttons. The wrist rest is removable so you can adjust your arm/wrist positions to suit your needs. DPI switch button is located on the top of the mouse for convenience. Compatible with most versions of Windows OS, Mac OS X, Linux.