<ul><li>Ergonomic comfort design, relaxed hand and arm: the comfortable, sculpted ergonomic shape naturally fits your hand</li><li> Smooth thumb control, precise tracking: great cursor control on any surface</li><li> Perfect for tight workspaces: because the trackball doesn&#39;t move, it&#39;s perfect for tight workspaces and busy desks</li><li> Two ways to connect and multi-OS: connect simply with Bluetooth or the USB receiver and never worry about drop-offs or lag up to a 33 ft. (10m) range</li><li> Up to 24-month of use from a single AA battery with the USB receiver, you might just forget your trackball uses batteries at all</li><li> Convenient controls: moving between documents or browsing your favorite websites is a breeze with large, easy-to-reach Back/Forward buttons and the precision scroll wheel</li></ul>