Big Expansion: Instantly add four USB 3.0 ports to any compatible PC or Laptop. Transform one of your computer' s USB ports into a full work station, perfect for connecting an external hard drive, a keyboard, mouse, thumb drive, or any other USB-enabled device and eliminating the hassle of having to "switch" between devices. (Does not support charging) SuperSpeed Data: Enjoy SuperSpeed USB 3.0 data transfer rate at up to 5 Gbps, 10x faster than USB 2.0fast enough to transfer an HD movie in seconds. Works with USB 3.0, 2.0, or 1.1 host controllers and devices on Windows, Mac, and Linux/Unix computers. Transfer rates are device and USB host controller dependent. Blue LED indicates normal operation.