According to Thunderbird's official website, the RazerFocus+20,000DPI optical sensor used in the V2 is a high-precision mouse sensor. dpi, or dots per inch, is a unit of measurement for mouse resolution, and the higher the value, the higher the mouse's positioning accuracy. The RazerFocus+ 20000DPI optical sensor on the Purgatory Viper V2 provides very accurate and smooth mouse movement trajectories for a variety of demanding gaming and office scenarios.