IOGEAR SD/MicroSD/MMC Card Reader/Writer, GFR204SD Bus Powered - No External AC Adapter Required Two Media Slots - SD/MMC and Micro SD Support Windows XP/Vista/Win7 or Mac OS9.X and Up USB 2.0 High Speed Data Transfer Rate Up to 480 Mb/sec Plug-n-Play Bus Powered - No External AC Adapter Required Two Media Slots - SD/MMC and Micro SD Support Windows XP/Vista/Win7 or Mac OS9.X and Up Plug-n-Play USB 2.0 High Speed Data Transfer Rate Up to 480 Mb/sec