The Simplecom CR309 is a SuperSpeed USB 3.0 3-Slot Card Reader that offers an easy solution to access and protect your memory cards, including SD, SDHC, SDXC, Micro SD/SDHC/SDXC and CompactFlash cards. Capable of being plugged directly into the USB port on any desktop or notebook computer, you can easily transfer files from your memory cards to your computer at up to 5Gbps. It features built-in storage for 3 different sized cards, built-in foldable USB cable, and is compatible with Windows and Mac.