A new standard of comfort and precision. Logitech's most advanced trackball mouse for trackball enthusiasts and consumers looking for alternatives to mice and touchpads. The adjustable hinge of the MX Ergo ball mouse offers comfortable use. Thanks to the unique adjustable hinge, you can choose the best angle for you between 0-20° to get your hand in a more natural position. Thanks to its ergonomic features, the Logitech MX Ergo causes 20% less muscle strain than a standard mouse. The MX Ergon ball mouse's precision scroll wheel has horizontal scrolling and a nifty middle button click, plus the precision mode button lets you instantly switch between fast and precise tracking. Logitech FLOW technology guarantees effortless working on several computers. You can connect the MX Ergo ball mouse to two computers, work on them at the same time, and you can easily switch computers by pressing a button. MX Ergo's quick-charge battery lasts up to 4 months on a single charge. Connect the MX Ergo ball mouse to your computer with the included Logitech Unifying receiver or via Bluetooth.