MULTI-AWARD WINNING RAZER™ MECHANICAL SWITCHES, RAZER CHROMA BACKLIGHTING WITH 16.8 MILLION CUSTOMIZABLE COLOR OPTIONS, MANUFACTURED TO PERFECTION,ENGINEERED FOR DURABILITY, TECH SPECS - 10 key roll-over anti-ghosting, SYSTEM REQUIREMENTSPC or Mac with a free USB portWindows® 10 / Windows® 8 / Windows® 7 / Mac OS X (v10.8 - 10.11)Internet connection, 100 MB of hard disk space, connection needed to activate full features of product and for software updates. After activation, full features are available in optional offline mode.