PC or Mac with a free USB port Windows 8/ Windows 7 / Windows Vista / Windows XP (32-bit)/ Mac OS X (v10.7-10.9) Internet connection 100MB of hard disk space Razer Synapse registration (requiring a valid e-mail), software download, license acceptance, and internet connection needed to activate full features of product and for software updates. After activation, full features are available in optional offline mode.