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Description:Features: 1) Expanded four USB ports, supply up to 550mAh current per port 2) Adopt USB controller 3) No external power supply 4) Driverless, hot plug and play 5) Internal over current protection circuits 6) Support USB 1.0 / 1.1, compatible with USB 2.0, full speed up to 12Mbps 7) Supported OS: Windows 95 / 98SE / ME / 2000 / XP, Linux 2.4 and Mac OS 8.5 or above 8) Chain up to 127 USB drives