Vktech&reg; Portable High Speed Four Ports USB 3.0 External Hub Adapter for PC Laptop High-speed USB 3.0 adapter with 4 ports allowing for connection of up to 4 external USB devices Compact USB 3.0 adapter with 4 ports Backward compatible with USB: 2.0/1.1 Ideal if you need that extra port to connect additional USB devices such as printers, scanners, game pads etc System requirements: Windows XP, Vista, Win7/8, Mac OS (10.x or above)