AVANTEK 4 Port USB 3.0 Hub Cable with 12V/3A Power Adapter Charging Port for iMac, Macbook, iPhone, iPad, Smartphone, Laptop Computer Enables transfer rates of up to 5 Gbps, 10 times the speed of the older USB 2.0 standard; backwards compatible USB 2.0 / 1.1 Each port supports BC 1.2 charging and supplies up to 1.5A current to BC 1.2 compliant devices (please refer to the Product Description for further details) Expands 1 USB 3.0 port into 4; plug-and-play with no drivers required on Windows 8 / 7 / Vista / XP and Mac OS X v10.2 and above Each port supplies up to 2A current to charge any USB device at full speed when the hub is disconnected from the computer Equipped with a 12V / 3A adapter for sufficient power supply and stable connections; built-in surge protector keeps your data and devices safe