Wireless mouse features a high-performance design to provide precise control and comfort. Darkfield laser tracking works on virtually any surface including glass and high-gloss surfaces. Precision scroll wheel auto-shifts from click-to-click to hyper-fast scrolling to let you quickly navigate through long documents and 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 and easily using the including Unifying receiver or through Bluetooth smart wireless technology. Easy-switch technology means you can pair up to three devices and 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.