standards : usb specification version 1.1, usb specification version 2.0 , ohci, uhic, ehci no of ports : 1 upstream usb type b port, 7 downstream usb type a ports connectivity rules : 5 cascaded hubs maximum, 5m maximum between each hub up to 127 devices o.s. support: windows 98se, me, 2000, xp (for usb 2.0) macos x 10.1 and above (for usb 2.0) , macos 8.6 and above (for usb 1.1 only) dimensions : 104 x 63 x 29mm ( lx w x h ) * diagnostic leds provided * connects to ac power source through an external ac power adapter * backward compatible with usb 1.1 * pocket-sized, lightweight * up to 40 times faster than usb 1.1 * supports both low-speed 1.5mbps devices, full-speed 12mbps devices & high-speed 480mbps, each port creates a bridge between the peripheral & host computer.