Optical Sensor Adopt high precision infrared sensor, more accurate than ordinary mouse positioning. Ten Million Times Circulating Mechanical Button Support fast response to ensure smooth movement and not appear frame drop, Caton and other awkward pheno menon in fierce games. Cool Backlight Effects Colorful LED backlights let you enjoy the game's pleasure. Non-slip Wheel Scroll up and down function helps for daily office or browsing the web, anti-slip design, fast scroll, easy to operate.