SODIAL High Speed USB 3.0 Hub 4 Port Splitter Adapter 5Gbps Portable for PC Laptop Ultrabook Notebook MacBook Air Tablet Computer Peripherals Black Complys to USB3.0 specification and 5Gbps theoretical transmission speed. Downwards compatible with USB2.0, USB1.1 and USB1.0. 4 * USB3.0 ports support 4 USB devices used at the same time. Uses high performance chipset, more stable and secure. USB Bus powered, low power consumption design, provides powerful and stable power supply for each port.