High Speed USB 2.0 4 Slot SD Card Reader/Writer with 3 ports USB 2.0 Hub 4 slots on top, available for using SD/SDHC/SDXC/MicroSD/MicroSDHC/MicroSDXC memory cards, USB 2.0 high speed transfer between 4 cards without changing each memory cards Reads and write at same time, Support up to 64GB Hot swappable, plug and play, no driver needed, Detachable USB 2.0 data transfer cable for easy carrying Unit size: 35mm x 54mm x 45mm, Cable length: 400mm, Plug & Play, no driver requires Windows XP/Vista/7/8, Mac OS X 10.2 - 10.6.4