Verbatim 96676 Desktop Laser Mouse Laser - Precision movement and control with laser sensor tracking. Multi-Button - Enjoy one-click access to key functions with 3 programmable buttons. Comfort Grip - Smooth, textured grip. Designed for comfort and control. Speed Control - Change speed with one touch. 3 settings with up to 1600 dpi sensitivity System Requirements: USB 2.0 (Also compatible with USB 1.1 ports) Windows XP, 2000, Vista Mac OS 10.4.X and higher