UNITEK 6-Port USB 3.0 SuperSpeed Hub and 2 Charging Port with 12V 4A Power Adapter, Support for Android, Apple iOS, and Windows Mobile Devices Upgrade to 6 USB 3.0 ports with built-in surge protection + 2 super-fast charging port (5V 2.1A) which can charge your mobile devices with two charging voltage of up to 2.1A Plug and play. Supports hot swapping. No install driver needed; LED indicators display the status of DC power supply and USB connections Supported Operating Systems: XP/ Vista/ Windows 7/ 8 ; Mac OS X 10.8.4; Linux; Backward compatible with USB 2.0/1.1 High Performance with VIA VL812 Chipset; Safe and reliable; Build in Overvoltage/Overcurrent/Leakage and Short-Circuit protection unit SuperSpeed USB 3.0 supports transfer rates up to 5 Gbps - The actual transmission speed is limited by the setting of the device connected