E-Blue Mazer 2500 DPI Wireless Gaming Mouse (EMS152BK) Ergonomically designed for right-handed gamers utilizing 'Air Wing' concept Adjustable DPI (Dots Per Inch) switch 500 / 1200 / 1800 / 2500 Avago 5090 High-performance Optical Gaming Chipset 2.4G Wireless Transmission Technology (Stable signal in 30 ft. radius) High 3000 Frame/second Rate for extremely precise Tracking Level High 3000 Frame/second Rate for extremely precise Tracking Level Requires 2xAA batteries OMRON Micro Switch provides lifespan of up to 5 million button clicks Ergonomically designed for right-handed gamers utilizing 'Air Wing' concept Adjustable DPI (Dots Per Inch) switch 500 / 1200 / 1800 / 2500 Avago high-performance optical navigation gaming sensor 2.4G Wireless transmission technology (30 ft. radius) High FPS rate for extremely precise tracking level Requires 2xAA batteries (Not included) OMRON Micro Switch provides lifespan of up to 5 million button clicks