To connect up to 4 USB devices (e.g. a printer or a mouse) to a USB port. Integrated, high-quality connection cable. USB Standard: USB 2.0 (backward compatible). USB lead length: 1.5m. Bus-powered, i.e. The voltage is supplied via the USB bus. Voltage supply also possible via external power supply unit (not included). Includes bus overvoltage protection. For Windows® 2000 from SP 3/XP from SP 1/Vista™/7 and Mac OS 10.x. Silver.