NZXT Avatar S Gaming Mouse Review @ Overclockers Online
 

The DPI setting can be changed by holding down the left side
button and scrolling the wheel. The color of the NZXT logo changes to
indicate your setting. Blue indicates 1600 dpi, purple is 800 dpi, and
red is 400 dpi. All in all, the NZXT Avatar S is a pleasure to use and
performs as advertised. It feels very precise and the ergonomics are
top-notch.

http://www.overclockersonline.net/nz...-gaming-mouse/