Contoured shape: Designed so you can game longer without fatigue Custom, gaming grade native 16000 DPI optical sensor with 1 dpi resolution steps for high accuracy performance Interchangeable thumb grips: Choose between 3 styles of thumb grips for a tailored fit Onboard profile storage: Saves lighting effects, macros and DPI settings for universal access to your profile on any PC, without the need for drivers or additional software Custom tuned for gaming left and right button switches provide ultrafast response and are rated for 50 million clicks Assign macros to any button and create dynamic lighting effects with CORSAIR Utility Engine (CUE) Optimize sensor precision and responsiveness for your playing surface