This is the wireless vertical laser mouse designed to criteria set by leading ergonomists and certified by United States Ergonomics that helps reduce muscle fatigue and improve posture. From Logitech, maker of innovative personal computer peripherals for almost 40 years, the mouse’s natural handshake position and 57° vertical angle reduce pressure on your wrist, while your thumb is positioned comfortably on the thumb rest. Its 4000 DPI high-precision sensor and dedicated cursor speed switch results in 4X less hand movement while the textured rubber surface assures a solid and natural grip. With four customizable buttons, scroll wheel, and precision wheel. Rechargeable battery provides almost four months of use on a full charge. Connects wirelessly via Bluetooth or included USB receiver, or with USB-C charging cable. Software requires Windows 10, 8, or 7 or Mac OS 10.10 or later. 5" H x 3" W x 3 3/4" D. (4 3/4 oz.)