EZOWare SuperSpeed USB 3.0 4-Port Hub with 4 Feet Cable and External Power Adapter, Backwards Compatible with USB 2.0/1.1, Supports Windows OS and Mac OS X Super slim 4 USB 3.0 ports with over-current detection and protection for easy expansion. SuperSpeed USB 3.0 supports transfer rates up to 5 Gbps - The actual transmission speed is limited by the setting of the device connected Self powered and support a data transfer rate of up to 5Gbps (10 times faster than USB 2.0). 4 Feet Cable - flexible for desktop computers. External Power Adapter - for power hungry devices.