This hub offers you the 4 USB-ports for expansion at SuperSpeed 5Gbps, plus the optional external Micro USB power supply, it can supply power to peripheral devices. 4-Port USB expansion with USB3.0 5Gbps SuperSpeed Optional external Micro USB charging port Small, elegant and portable. User friendly design, cable can be kept in a more organised manner. With USB3.0 specification, data transfer speed up to 5Gbps. Backward compatible with USB2.0/1.1. Plug and play, no need to install a drive. With BC1.2 charging technology (Total power output up to 2.4A if it is connected to external power supply  through Micro USB port.).