Razer BlackWidow Ultimate Stealth - Backlit Mechanical Gaming Keyboard - Fully Programmable - Tactile & Silent Razer Orange Switches Multi-Award winning Razer Mechanical Switches - Razer Orange Switch with tactile bump for the best overall silent gaming performance Extreme Durability - Razer mechanical switches are rated up to 80 million keystrokes and come with a 2-year warranty Individually programmable Razer Green backlit key with dynamic lighting effects USB 2.0 and Audio pass through for easy cable routing and system requirement is windows 10 / windows 8 / windows 7 / mac OS X (v10.8-10.11), 100 MB of hard disk space,internet connection Contained - Brightest;Fully programmable keys with on-the-fly macro recording