Overview: Can work normally by bus-power Support hot swapping-plug & play Automatically switches to the highest speed supported by peripheral Support EHCI amp;UHCI amp;OHCI Note: A random color will be dispatched if this product color becomes out of stock. Specification:3 USB (Universal Serial Bus) 2.0 High Speed ports plus 1-port for iPod/iPhone Provides 3 USB (Universal Serial Bus) host ports that work with Hi-Speed (480 Mbps) full-speed (12 Mbps) & low-speed (1.5 Mbps) data transfer rates, 1-port for iPod/iPhone for charging & data transferring Support Windows 98, 98SE, 2000, ME, XP, VISTA & Mac OS X or later version Backward Compatible with USB1.1 Connect up to 127 devices together (Through daisy chaining) Size Approx:15 x 11 x 1 cm Weight