Ghost Optical Mouse - Fun Series Advanced Optical Technology  800 dpi optical resolution provides smooth and precise movement on 3-Button Scroll Operation  Left right and center buttons with rubberized non-slip scroll wheel for USB or PS2 connectivity - Provides simple plug-and-play convenience for any computer right out of PC and Mac compatible - For use with your existing computer: Apple MacOS X or later Microsoft Warranty: Backed by a 3-year manufacturer&apos;s warranty