E-Blue Cobra Advance Wireless Gaming Mouse (EMS609BK) Black with inlaid silver plating soft-touch shell with distinctive blue LED design Adjustable DPI (Dots Per Inch) switch 500 / 1000 / 1800 Avago high-performance optical navigation gaming sensor 2.4G Wireless transmission technology (30 ft. radius) High FPS rate for extremely precise tracking level Requires 2xAAA batteries (Not included) OMRON Micro Switch provides lifespan of up to 5 million button clicks