Introduction:This is USB hub , and integrated USB to serial port function , suitable for 3 / 2 / B+ / / W. It will make you rid of the of of USB port on your , expecially for .Features:4 USB expansion ports, compatible with USB2.0 / 1.1 transmission. USB to UART for for serial debuggingMultiple indicators for easy access to power, USB to UART and USB expansion interfaceOperating voltage: 5VProduct Size: 65mm 30mmFixed hole diameter: 3.0mcolor: blue Material: PCBPackage Contents:1 x USB Hub Extension Board ( not include )1 x -USB Cable1 x -USB AdapterOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.