Cdycam Wireless Vertical Upright Optical Mouse Ergonomic Gaming USB Healthy, 1600 DPI, 2.4G Human engineering vertical mouse, wrist-healing, providing a health working method Compact size and excellent sensitivity, convenient to carry and easy to operate Adjustable optical sensor, 800 / 1200 / 1600DPI, high sensitivity, it has advanced mouse sensor performance Connectivity: wireless ,10 meters efficient distance Vertical grip designed, Ergonomic designed, give a comfortable grip, which is perfect solution to the wrist fatigue.