James Donkey 112 Original PAN3509 Sensor Ergonomic USB 2.0 Optical Flexible Gaming Wired Mouse (From Red Dot Award Design Team,Black) Ergonomic shape, comfortable hand feeling Adjustable resolution feature: 1000/1600/2000DPI Resolution: 1000-1600-2000 three DPI shift (1600 for start) Compatible with Windows XP, Vista, Windows 7, ME, 2000 and Mac OS. User for: The high-end players, gaming professional players.