A new standard of comfort and precision. Logitech®'s most advanced trackball for trackball enthusiasts 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 two computers and easily switch between them, copy and paste text, images and files. Connector/Port/Interface: USB; Left/Right Hand Use: Right Hand; Mouse Technology: Optical; Wired/Wireless: Wireless.