• Fast Response - 1200 dpi true optical resolution sensor reduces hand movements. Great for games. (Other mice have 800 dpi)<br />• Easy Clicking -  The button force is light for easy clicking, but still firm enough to avoid accidental actuation.<br />• Programmable - 5 buttons -- 4 are programmable with 59 selectable functions each with Windows driver, plus special features such as:<br />•  Vertical scroll - press a button and drag the mouse to scroll with greater precision and control than the scroll wheel.<br />•  Auto click - automatically perform a double click by pausing the pointer.<br />•  Click lock - press and hold a button momentarily to simulate continued pressing without holding down the button. <br /><br />• Compatibility - PC<br />•  5 buttons -- 4 are programmable with included Windows driver.<br />•  Windows® XP, 2000, NT, ME, 98SE.<br />•   USB, PS/2. <br /><br />• Compatibility - Mac<br />•  2 buttons in OS X, 1 button in OS 9. Separate driver available for $20 at usboverdrive.com enables all buttons.<br />•  USB port.<br />•  UNIX<br />•   3 buttons without additional driver.<br />•  USB port. <br /><br />• Compatibility - Linux<br />•  5 buttons in XFree 4.0.1 or higher without additional driver.<br />•  USB port