SIIG's SuperSpeed USB 3.0 4-Port Powered Hub expands a single USB connection from your laptop or desktop computer to four USB ports to enable multiple device connections. It instantly adds 4 USB 3.0 ports to your system delivering ultra-fast data transfer rate of up to 5Gb/s to support high-bandwidth demanding USB 3.0 devices. Built-it over-current protection is provided to safeguard the hub from unforeseen power surges. It comes with an AC power adapter to supply external power source, if needed, great for power-hungry devices such as external storage devices. Ultra-slim design with built-in woven braided USB cord enhances portability and durability. It is an ideal USB port expansion solution to gear up device connectivity for business, home office or on-the-go.