- For connecting up to 4 USB devices (e.g. a mouse, keyboard, printer, external hard drive) to one USB port ,- Additional power supply unit for power supply ,- Additional USB cable for connecting to a PC/laptop ,- Suitable and tested for USB 2.0, downward compatible with USB 1.1 , ,System Requirements: ,- Operating system: Windows 10/8/7/Vista/XP and Mac OS 10.x - Connection Cable: Removeable ,- Number of USB Ports: 4 Ports ,- USB Standard: USB 2.0 ,- Model: With Power Supply ,- OTG Capable: No ,- Colour: Black 2 years legal warranty only