hi, according to Microsoft Technical Data Sheet, Microsoft IntelliMouse Explorer 3.0 have
Tracking Speed Up to 54 inches (1371 millimeters) per second
Tracking Acceleration Up to 25G

while, Microsoft IntelliMouse Optical 1.1a and Microsoft Wheel Mouse Optical 1.1a have only Tracking Speed Up to 20 inches (508 millimeters) per second,

the rest of specs is the same,

Tracking Technology
Mouse Tracking System Microsoft-proprietary optical technology
Imaging Rate Dynamically adaptable to 9000 frames per second
X-Y Resolution 400 points per inch (15.75 points per millimeter)

is that really such a different? coz what i heard was this 3 model use the same optical sensor.

http://www.microsoft.com/hardware/en-us/p/int....0#support

http://download.microsoft.com/download/3/F/8/...rer3.0.pdf


http://www.microsoft.com/hardware/en-us/d/intellimouse-optical

http://download.microsoft.com/download/C/F/F/...ptical.pdf


http://www.microsoft.com/hardware/en-us/d/wheel-mouse-optical

http://download.microsoft.com/download/3/3/8/...ptical.pdf