Logitech's most advanced trackball for trackball enthusiasts and consumers looking for alternatives to mice and touchpads. Provides 20% less muscle strain than a standard mouse. An intelligently adjustable hinge guarantees personalized ease of use. The “Precision Mode” button enables instant switching between high-speed tracking and high-precision tracking. Easy-Switch and FLOW-capable for effortless workflow across multiple computers. Pair up to 2... computers and switch between them with ease. Use the “copy and paste” function for text, images and files. The quickly rechargeable battery lasts up to 4 months on a full charge. * Connectivity via the supplied LOGgitech Unifying receiver or via Bluetooth.