Ergonomically designed, minimizes user fatigue. High quality AVAGO A3000 sensor for high stability, accuracy control and fast reaction. Allows 2times longer battery life through working mode and 3stage stand by mode. Passed button life test and proved to last over 5,000,000 clicks. Use DPI Switching Button to quickly switch among 1000, 1500, 3000DPI along with beep sounds. Teflon used to reduce the friction force for faster and more accurate mouse control. Scroll wheel designed to allow accurate scrolling during internet surfing and gaming. No need to worry about loosingthe USB during transport. Remove the cover with one button and replace AA size batteries.