E-Blue Cobra Type-S 1600DPI Optical LED Compact Gaming Mouse (EMS128WH) 4-inches long Mouse designed for Gamers with Smaller Hands Adjustable DPI (Dots Per Inch) switch 400 / 800 / 1600 High Performance Chipset possessing 16 G-Force Acceleration Red Wave Sensor operates on most Surfaces including Glass Micro Switch provides Lifespan of up to 3 Million Button Clicks Fast Action Forward and Backward or Weapon Switch Side-Keys Rubberized Scroll Wheel for impactful Tactile Experience No drivers required 'Plug and play'