CM Storm Inferno - Twin Laser MMO Gaming Mouse with MacroPro Key for Automated Commands Features designed with MMO games in mind 4,000 DPI twin laser sensor with on-the-fly buttons to quickly cycle through DPI levels 9 programmable buttons with up to 32 button output using unique Storm Tactics Multiplier Key 128 KB of onboard memory to store button assignments, macros, and up to 3 profiles Versatile MacroPro Key allows easy access to pre-programmed commands such as macros, scripts, mouse motions, and actions System Requirements: PC or Mac with USB port. Windows 8, Windows 7, Windows Vista, Windows XP, and Mac OS X (Plug-n-Play Support Only)