E-3lue Cobra EMS622BKAA-NU 6-button Blue LED Wired Optical High Precision Gaming Mouse for PC and Mac Cobra EMS622 is the latest upgraded version of Cobra Series,6 Buttons (Left/Right/wheel/Forward/Backward/DPI),Compatible with Windows XP/ Vista/ 7/ 8/Mac OS and other OS,plug & play. LED scroll wheel and Blue pulsating lights;Perfectly designed to fit snugly under your palm, the ergonomic shape gives gamers the most comfortable gaming experience ever High-definition optical tracking enables responsive cursor control for precise tracking and easy text selection Micro Switch provides lifespan of up to 5 million button clicks Incredible (variable) 3 Levels of DPI selection,You can move it at either fast or low speeds,and it will always respond onscreen with exacting accuracy.