Kensington Orbit Wireless Trackball Mouse (K72352US)

A distinctive centered-ball design gives you more comfort and precision
2.4 GHz wireless with storable nano receiver works wherever you do
Unique touch scrolling lets you glide effortlessly through web pages and documents
Wireless operation with USB dongle
Touch Scrolling
This unique feature lets you slide your finger around the outer ring of the trackball, letting you glide effortlessly through web pages and long documents.

TrackballWorks Customization
Free downloadable software provides an even more personalized experience, giving you the ability to assign a wide variety of program functions to each of the 2 buttons, as well as adjusting cursor and scrolling speeds
Optical Tracking Technology
Internal red optics precisely track the movements of the compact 32mm ball, providing superior accuracy so you can quickly get your cursor where you want, improving productivity and efficiency