1.A USB interface is extended to four, small, practical, convenient, each power supply up to 500 mA. 2.Directly connected to the computer, without external power supply, simple to use. 3.Using the second generation of USB HUB controller. 4.USB2.0 interface, support USB1.0/1.1/2.0, transmission speed 12-480MBPS. 5.Built-in current overload short circuit protection. 6.Streamlined super mini design. 7.Adopt high quality high quality electronic components, stable operation.