6400 DPI HIGH PRECISION OPTICAL SENSOR: Provides on-the-fly sensitivity adjustment with dedicated (reprogrammable) DPI buttons for gaming and creative work. Durable Mechanical Switches: Supports up to 10 million clicks. Rubber grooved wheel for maximum accuracy: Small tactile bumps increase grip and allow for more controlled scrolling in gaming situations. 5 Programmable Buttons: Allows button programming and assignment of complex macro functions via Razer Synapse.