Logitech MX Revolution is a cordless laser mouse with two scroll wheels.
Pro Two mode scrollbar
It can work both as an incremental and free-spinning wheel which can be activated by a customized "SmartShift" setting.
Pro Auto adjusts scroll speed depending on page size
Pro Thumb-side wheel for application switching
If you're working between two or more programs, or documents, a quick push on the scroll wheel, up comes a box with all the running applications/docs right under your mouse cursor.
Pro Integrated search button
Connects instantly to your preferred search engine from a dedicated topside button. All you do is highlight a word, or phrase, hit the search button and you're there.
Pro Accurate, responsive, works on any surface.
MX Revolution offers top end tracking and accuracy that works on almost any surface.
Pro Easy to charge
Just put it in the cradle overnight and done. Additionally, the MX Revolution would stop discharging when you stopped using it. Leave it on the table overnight, and its charge level will be the same tomorrow.