Details :
Ergonomic, right-handed contour trackball mouse design Built-in 1.25 in. large trackball with optical sensor Removable trackball allows for easy cleaning 7 buttons--forward, backward, left, right, scroll wheel, and DPI up/down 400 to 4800 DPI range 2.4 GHz wireless USB nano receiver with up to 30 ft. range Power on/off switch 10-million-click life cycle, durable microswitch Includes USB receiver, 2 AAA batteries, and quick-start guide
Warranty : ONE YEAR