Logitech Optical Marble Mouse (USB/PS2)

Comfortable ambidextrous trackball. Fingertip control with advanced optical sensor for exceptionally smooth tracking. Sleek ambidextrous design that fits either hand comfortably. Large trackball that improves control while reducing hand and wrist motion. Optical technology provides precision and accuracy, free of ball cleaning and unsurpassed reliability. Customizable buttons for easy access to key tasks. Windows 98, 2000, Me, XP, Vista certified and Mac OS 8.6 or later. USB and PS/2 connectivity. Manufacturer's three-year warranty.

Logitech's Optical Marble mouse gives you the familiarity of a mouse with the convenience of trackball navigation. Designed for comfort in either hand, this space-saving, four-button trackball boasts Logitech's innovative optical tracking system to deliver superior precision and smooth motion with virtually no maintenance or cleaning required. You get two ways to scroll: click two small buttons for page up and page down, or click one of two large buttons and use the ball for auto scrolling. The trackball gives you precise fingertip control, and the included WebWheel software enhances your Internet browsing. Two AA batteries (supplied) keep the Marble mouse racing for about three months.