specifications: contoured shape: designed so you can game longer without fatiguecustom, gaming grade native 16000 dpi optical sensor with 1 dpi resolution steps for high accuracy performanceinterchangeable thumb grips: choose between 3 styles of thumb grips for a tailored fitonboard 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 softwarecustom tuned for gaming left and right button switches provide ultrafast response and are rated for 50 million clicksassign macros to any button and create dynamic lighting effects with corsair utility engine (cue)optimize sensor precision and responsiveness for your playing surface