Features: Add 4 USB 2.0 hi-speed ports Fully compliant with USB 2.0 specification Supports up to 127 hi-speed devices Backwardly compatible with USB 1.1 Supports data transfer rate at 1.5/12/480Mbps Individual port over-current protection Easily portable Provide up to 500mA per port which is sufficient for diverse devices Power from USB port Power adapter included Plug-and-play Hi-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/Vista OS Specifications: Interface: USB2.0, compatible with USB1.1 Data transfer rate: 1.5/12/up to 480Mbps 4 separate port USB2.0 expansion Bus-power limit current protection: 500mA