E-Blue Cobra Type-M High Precision Gaming Mouse (EMS131BK) Geared with High-performance Optical Navigation Gaming Sensor Adjustable DPI (Dots Per Inch) switch 400 / 800 / 1600 PAN3509DH-TXWA High Performance Chipset possessing 16 G-Force Acceleration Micro Switch provides Lifespan of up to 3 Million Button Clicks Fast Action Forward and Backward Keys with precise Micro-switch Rubberized Scroll Wheel for impactful Tactile Experience 20 Gramms of Weight added for effortless Stability Control No drivers required 'Plug and play'