... to customer. A, The product descriptionThis product is a 4-port USB HUB advantages of small size and portability, built-in ... first connection, the computer will be prompted to find a USB HUB device, and then indicator light flashes three times ... been flashing that normal operation. C, Specifications Parameter1. USB port 2.0.2.4 USB extension port3. USB port maximum withstand current of 500mA.