Move content between 3 computers. Download Logitech Flow and move text, images and files seamlessly between devices. Darkfield™ High Precision tracking. Enjoy flawless control on virtually any surface, even glass. (4mm min. thickness) Fast recharge. Power up for a full day of usage in just 3 minutes. Holds power up to 70 days on a full charge. Hyper-fast scrolling. Speed adaptive scroll wheel switches from click-to-click to ultra-fast scrolling. Experience side-to-side scrolling with a simple thumb stroke. Comfortable shape. Carefully crafted to support hand and wrist in a comfortable natural.