CM Storm Havoc - Ergonomic MMO Gaming Mouse with Storm Multiplier Key for 16-Button Output Features designed with MMO games in mind 100-8,200 DPI laser sensor with on-the-fly buttons to quickly cycle through DPI levels 8 programmable buttons with up to 16 button output using unique Storm Tactics Multiplier Key 3 multicolor LED zones: scroll wheel, DPI buttons, and CM Storm logo 128 KB of onboard memory to store button assignments, macros, and up to 4 profiles Japanese-made Omron Micro Switches for enhanced tactile feedback and speed with a lifespan of at least 5 million clicks Special rubberized side grip for improved stability and mouse swipes 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)