This case is an aluminium housing for 3.5Inch hard drives so you can use one of your computer's existing USB ports to add an additional hard drive without having to open up your PC. Features: - Fast and easy USB2.0 solution for PCs and Macs - Backwards compatible with USB1.1 for connection to older machines - USB2.0 allows transfer rates up to 480Mbits/s - 'Plug and Play' compatible Operating System Support: - Windows 98SE, 2000, ME, XP - Mac OS X 8.6 upwards Package Contents: - 3.5Inch HDD aluminium enclosure - USB A-A type cable - Installation/driver CD - Manual - 5V/2A + 12V/2A switching power adapter - AC power cable