Wireless mouse features a high-performance design to provide precise control & comfort. Darkfield laser tracking works on virtually any surface including glass & high-gloss surfaces. Precision scroll wheel auto-shifts from click-to-click to hyper-fast scrolling to let you quickly navigate through long documents & web pages. Unique thumb wheel lets you experience side-to-side scrolling with a stroke of your thumb. Customizable functions allow you to unlock the full range of possibilities to meet your specific needs. Dual connectivity can be used to connect the mouse quickly & easily using the including Unifying receiver or through Bluetooth smart wireless technology. Easy-switch technology means you can pair up to three devices & easily switch between them with the touch of a button. Fast-charge the battery with enough power for a full workday in just 4 minutes. The battery can last up to 40 days on a full charge.