· Compatible With Universal Serial Bus Specification ver2.0 And Also Backward Compatible With USB1.1 · USB 2.0 transfer rate up to 480Mbps ,backward USB 1.1 transfer up to 12Mbps · Data copying between cards without storage intermediate,and it also allows you to upload photos/data from compatible media cards to a computer’s hard driver · Four card slots in-use one active LED · It is compatible with WinME,Windows 2000 and Windows XP,Windows Vista operating system,it is also compatible with Mac OS 9.2 or higher operating system, · Metal Frame for 3.5" drive bay