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Description:Product Description * Compliant with Universal Serial Bus Specification Revision 2.0 (Data Rate 1.5/12/480 Mbps) * Connects up to 127 USB Devices * Bus-power and self-power mode used * Plug-and-play function * 1 upstream and 4 downstream USB ports included * Over-current detection and protection * 1 red LED as power-on indicator (In some models, there is a green LED indicator for each downstream port apart from the red LED.) specifications * Desktop or notebook computer with USB port * One of the following operating systems (no driver needed): Win 98SE/Win ME/Win 2000/Win XP & Mac 10.1 up Advantages a. Guarantee/Warranty b. Best price c. Best delivery time d. Best service