Mad Catz R.A.T.9 Gaming Mouse for PC and Mac Lightweight Aluminium Chassis System Requirements: Connectivity: USB 2.0 Powerful Macro Programming: The R.A.T. 9 features six programmable buttons including the scroll wheel. Each button can be easily programmed to perform complex macros or simple key commands Customize Your DPI Settings: Four user-definable DPI settings range from 25 to 6400 and the DPI button lets you easily cycle through your custom settings Works with 64-bit & 32-bit Windows 8, 7, Vista, XP, Mac OS X 10.6.6 or later (requires Intel processor for Mac), Requires internet connection for driver download, Requires internet connection for driver download True 6400 DPI Laser Sensor: he Mad Catz R.A.T. 9 Gaming Mouse's new-generation 'twin-eye' laser sensor reads each axis separately and tracks up to a stunning six meters per second with pinpoint accuracy 2.4GHz Wireless Technology: A staggering 1ms response time ensures that your lightning-fast reactions remain lightning fast