USB 4 Ports Hub With On/OFF Switch Features :     Turns a single USB port into 4 USB 2.0 ports     Transfers your data at up to 480Mbps     Installs easily with Plug-and-Play convenience     Works seamlessly with all your USB 1.1 and USB 2.0 devices Specifications :     Supports "hot swapping" of all your USB devices     Lowers power consumption for longer battery life     Makes power supply optional in laptop applications     Offers lightweight， compact and design-perfect for travel Systems requirements Mac® : Mac OS®X v10.3 and higher PC: Windows 98，2000， Me， XP， Vista， and Win 7