Top Material : Aircraft Grade Aluminum Alloy Frame N-Key Roll Over : 84-Key Anti-Ghosting : 100% Illumination : Dynamic Per Key RGB Illumination Switch Type & Name : SteelSeries QX2 Mechanical RGB Switch Switch Actuation : 2 mm Total Travel : 4 mm Force : 45cN Lifetime : 50 Million Keypresses Compatibility OS : Windows and Mac OS X. USB port required Software : SteelSeries Engine 3.15+ (coming soon) for Windows (7 or newer) and Mac OS X (10.11 or newer) Depth