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. TrackballWorks is compatible with the latest operations system versions including Windows 7, Windows Vista, Windows XP and Mac OS. Expires Oct 27, 2013

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