Adesso iMouse G1 - Illuminated Desktop Mouse The optical sensor technology allows precision in pointing while letting you work on most glass, wood, marble, or leather surfaces without any need of a mouse pad Lighted mouse allows you to use the mouse in low-lit, highly technical or gaming situations where every second and measure of precision makes a big difference in winning or losing a game or adding a dimension in a drawing Ergonomic Design: iMouse G1's ergonomic design has been carefully shaped to fit to your hand's natural curves, eliminating hand strain, improving precision, and allowing comfort in gameplay and work for many hours DPI Switching :This mouse features four levels of DPI switching, ranging from 800, 1200, 1600 and 2400 at the touch of a button; The easily-accessible DPI button lets you quickly switch between the various computer tasks you partake in throughout the day Enhanced Optical Engine: This mouse features an optical sensor that improves speed, accuracy, and reliability while letting you work on most glass, wood, marble, or leather surfaces without any need of a mouse pad