Suriora USB Hub, 4-Port USB 3.0 USB Hub, Aluminium Alloy Built for iMac, MacBook/ Pro/ Air, Mac Mini Windows XP/Vista/7/8 And More(silver) 1.Adds 4 unpowered USB 3.0 ports to your computer - Up to 5Gbps data transfer rate 2.Easy to set up, Plug-n-Play, Hot swappable, Hot pluggable.Compatible with all WindowsMacLinux systems. 3.Generous appearance design ,reasonable interface layout , LED lamp design, control the working state of USB devices 4. Easy to carry , It supports the overload voltage and instantaneous current protection function, effectively protect the devices and the hub. 5.Complies with USB 3 specifications, compatible with USB2.0/USB1.1