KENSINGTON Advance Fit Wireless Trackball
The Kensington Orbit Wireless Mobile Trackball offers a precise, compact and versatile experience with a centered-ball design. With no wires to tie you down, the 2.4 GHz wireless with storable nano receiver works wherever you do -- at your home or office. And the unique touch scrolling lets you glide effortlessly through web pages and documents. PC and Mac compatible.