Ultra Gaming-Grade PrecisionAvago sensor with high-resolution, 2400 dpi optical engine to achieve a perfect speed, precise orientation and smooth tracking in game process, to fully meet player"s requirement.Sensitivity Switching On the Fly TechnologyAdjustable dpi shift technology, no need to pause the game during the operation, no need to install the driver, switching instantly among three sensitivities of 1000/1600 2000/2400 DPI by a button. Choose suitable DPI setting freely, switch targeting precision to the lightening fast movement, so that player feel more powerful in the game.Super-refresh RateEnhanced refresh rate. Super-Refresh rate, so that players are at their pleasure during the game.Forward and Backward ButtonForward and backward buttons on the side enable to browse around the internet easily.Durable and Comfortable Wheel DesignNew scale wheel design. Anti-slip rubber with scale line to enhance the friction of wheel and a sense of control.Mode shift between single and double clickPress it once and click left button, it equals to click twice, special design for gaming. Press it again , restore the default.Contents:GM X5 Mouse, User"s ManualRequirements:Windows 95 98 00 ME XP Vista Win7 Win 8 MAC Linux OSUSB Port