Classic Optical Gaming Mouse, FPS Gaming Mice 2400 DPI, 4 LED Colors - Black AVAGO A3050 GAMING CHIPSET: this Gaming Mouse equiped with A3050 Optical Sensor, qualified for most of MMO/FPS/MOBA Games OMRON SWITCH: High precision, stable performance and durable, up to 20 million times click ERGONOMIC MOUSE: Perfectly designed to fit snugly under your palm, the ergonomic shape of this Gaming Mouse gives gamers the most comfortable gaming experience ever PLUG AND PLAY: additonal solfware is no needed, just plug and play, very easy and convenient WARRANTY: 30 days money back guarantee, and full 1 year manufacturer's warranty. Just send it back if you are not happy after you get the package. Why not try it?