Cool knight 2.0 HUB Notebook Laptop Dedicated 3 Ports Rotate Splitter Adapter 3 USB interface, and each output interface power supply up to 500 mah Comes with USB line, no need external USB line Not need install driver, plug and play, support hot plug Support usb device file transfer rate is as high as 480 megabits per second Built-in current overload, short circuit protection device to protect your computer and equipment from being damaged