- For connecting up to 4 USB devices (e.g. a mouse, keyboard, printer, USB memory stick) to a USB port- Topside socket allows you to plug USB devices in on the top for added simplicity and convenience- Bus powered, i.e. power supply via the USB socket of a PC/notebook- Integrated USB cable for connection with a PC/notebook- Suitable and tested for USB 2.0, downward compatible with USB 1.1System Requirements:- Operating system: Windows 2000/XP/Vista/7/8 and Mac OS 10.x