Adds 4 USB 2.0 hi-speed ports. -The Laptop USB Hub fully compliant with USB 2.0 specification -Backwards compatible with USB 1.1 -Mini USB 4-Port Hub support up to 127 hi-speed devices There is 4 connector but just one can use the out said all the same-Support data transfer rate at 1.5/12/480 Mbps -Individual port Over-Current protection -Friendly and ergonomic design Computer USB Hub is easy to carry -Provide up to 500mA per port sufficient for diverse devices -Plug & Play installation -Cable Length: ~40cm