Logitech G502 Proteus Core Tunable Gaming Mouse with Fully Customizable Surface, Weight and Balance Tuning Maximum dpi: 12000 dpi Mouse Adjustable Weight: 5 x 3.6g Operating System Supported: Windows 8, Windows 8.1, Windows 7 or Windows Vista System Requirement: Powered USB port Internet connection and 100MB hard drive space (for optional software download)