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From the Manufacturer

Experience the comfort of ergonomic design and the convenience of Tilt Wheel Technology, and work without interruption with longer battery life.

Tilt Wheel Technology
Experience unrivaled accuracy, speed, and control as you scroll through documents and Web pages.

Smart receiver
Go wireless with confidence. Smart technology reduces the likelihood of interruption by notifying you when it detects interference or low battery.

Three times the battery life
Finally, a solution to the top wireless hassle: Now you can work longer without interruption. Many users experience a half year of battery life!

Ergonomic design
Work in style and comfort. Designed by Microsoft ergonomics experts, the arched shape provides support for your hand in a natural, comfortable position.

36:T5a5,I bought this set to use with a docking station on a new notebook - the dock covers the keyboard and touchpad o