Classic design, stay outside persistent power supply, support hot swap, low power consumption. Suitable for U disk, reader, USB mouse, USB keyboard, scanner, digital camera, digital video camera, USB sound card, hard disk and other computer peripheral devices. Expand 4-port USB, each port power supply up to 500mA, using 2 generations of USB hub controller, no driver, plug and play, all using first-class high-quality electronic devices, ensure the stability of the product.