Add 4 USB 2.0 high speed ports Fully compliant with USB 2.0 specification Supports up to 127 high speed devices Backwardly compatible with USB 1.1 Supports data transfer rate at 1.5/12/480Mbps Individual port over-current protection Easily portable Color: silvery white Provide up to 500mA per port which is sufficient for diverse devices Power from USB port Power adapter included Plug-and-play High speed mini port used to connect with PC USB port with USB cable Requirements: One available USB port Microsoft Windows 98 SE, 2000, ME, XP, and Vista Specifications: Interface: USB 2.0, compatible with USB 1.1 Data transfer rate: 1.5/12Mbps/up to 480Mbps 4 separate port USB 2.0 expansion Bus-power limit current protection: 500mA