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. features adds 4 usb ports to desktop or laptop system using a single usb connection supports usb 3.0 data transfer rates up to 5gbps and backward compatible with usb 2.0 or usb 1.1 the included ac power adapter provides external power source when needed - great for power-hungry devices such as external storage devices ultra-slim design with built-in usb cord makes this usb hub an ideal expansion companion while on-the-go over-current protection feature further protects the hub from unforeseen power surges aluminum housing and molding with woven braided cable adds extra durability chipset via vl813