Kensington 72352 orbit wireless mobile trackball, black/red 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.