UNITEK Portable USB 3.0 4-Port High Speed Hub with BC 1.2 Charging with 5V 1.2A and Built-in USB 3.0 Cable LED for iMac, MacBook, MacBook Pro, MacBook Air, Mac Mini, Chrombook, Surface Pro Compact size and portable, easily add 4 USB 3.0 ports to your Macbook, Laptop, ultrabook and tablet PC. Works with USB extension cable and backwards compatible with USB 2.0/1.1 devices Enjoy data transfer rates of up to 5Gbps and spend less time syncing, backward compatible with USB 2.0 / 1.1. Note: actual rate will depend on the capability of your device The extra Micro B power helps you to charge effectively for high-power devices, such as your tablet or iPad and mobile phones.Meets all the standard from USB Battery Charging 1.2, each port provides current supply up to 2.4A which suits most mobile phones devices. Micro USB cable is not included. Build in Overvoltage/Overcurrent/Leakage and Short-Circuit protection unit. LED indicates activity status. Designed with a built-in surge protector to keep your devices safe.