Comes with 4 USB 3.0 Ports and USB cable attachedUp to 10x faster than USB 2.0Support USB powered, no extra power adapter neededBackwards compliant with USB 2.0Ultra slim and portable design2.9 x 1.46 x 0.41 inches / 1.02 ouncesWindows XP / Vista / 7 / 8 (32bit or 64bit); Mac OS 10.2.8 or later; Linux Kernel 2.6.30 or later..