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Microsoft Sidewinder X3 Mouse USB - UUC-00004 

Features

 That Put You Ahead of the Competition
This versatile gaming mouse delivers speed, performance, and comfort for either hand.

2000 DPI laser tracking engine
Enjoy fast and furious gaming action with high performance laser tracking.

On-the-Fly DPI Switching
Switch sensitivity levels with one easy click. Choose from low DPI for accuracy or high DPI for fast movement. Three buttons instantly switch between 400, 800, and 2000 DPI - or you can customize settings using special software.

Comfort in Either Hand
Familiar shape for right or left handed comfort.

5 programmable main buttons
Map your favorite gaming actions. Customize your main gaming buttons to your preference.

Macros
Customized spells and action movements are easy. Included software lets you create and assign macros for enhanced programmability.

Recessed Side Buttons
Easy access for gaming and everyday computing.

Engineered for SpeedEngineered for Speed
•Resolution: 2000 DPI laser
•Image Processing: 7080 frames per second
•Max Acceleration: 20 G
•Max Speed: 45+ inches per second
•USB Reporting: Full-speed, 500 Hz
•Resolution: 2000 DPI laser
•Image Processing: 7080 frames per second
•Max Acceleration: 20 G
•Max Speed: 45+ inches per second
•USB Reporting: Full-speed, 500 Hz

Weight-balanced Plus Wide Glide FeetWeight-balanced Plus Wide Glide Feet
Smooth handling and active feel. Smooth handling and active feel.

Wide Rubber Scroll Wheel
With detent clicking action.