Full Details from Amazon.com : http://www.amazon.com/gp/product/B002N2L6QU?tag=onigi-20

Razer Naga MMO 5600DPI Gaming Mouse

17 MMO-optimized buttons including 12 button thumb grid
5600dpi Razer Precision 35G Laser Sensor
1000Hz UltrapollingTM 1ms response time
200 inches per second max tracking speed
Zero-acoustic UltraslickTM feet