A new standard of comfort and precision. Logitech's most advanced trackball for trackball enthusiasts and and consumers searching for alternatives to mice and touchpads. Delivers 20% less muscular strain compared to a regular mouse. A unique adjustable hinge plus extra 10° wedge offer customized comfort - choose the best angle for you between 0°, 20° and 30°. Precision mode button allows to instantly switch between speed and precise tracking. Easy-Switch™ and FLOW-enabled for effortless multi-computer workflow. Pair up to 2 computers and easily switch between them, copy and paste text, images and files.

• Fast rechargeable battery. Holds power for up to 4 months on a full charge. Quick charge: 1 minute of charge gives up to a day of use.
• Easy-Switch? and FLOW-enabled for effortless multi-computer workflow. Pair up to 2 computers and easily switch between them, copy and paste text, images and files.
• Precision scroll-wheel with tilt and middle click allows for precise scrolling and convenient controls.
• Advanced tracking. Precision mode button lets you instantly switch between speed and high precision tracking.
• Choose the best angle for you 0?, 20? or 30?.
• Smart adjustable hinge plus extra 10? wedge for customized hand position and greater comfort.