Features: This is USB hub, and integrated USB to serial port function , suitable for raspberry 3B/3B+. It will make you get rid of the trouble of lack of USB port on your raspberry, expecially for raspberry. 4 USB expansion port, compatible for USB2.0 / 1.1 transmission. USB to UART for Raspberry for debugging Compatible for Raspberry 3B/3B+ and other development boards Onboard USB output indicator light and UART communication status light Specifications: Component:Plastic Size:Approx.65x30.2mm/2.56x1.26inch Option Type:1pc,2pcs for Raspberry 3B/3B+ Operating voltages: 5V Package Includes: Package A 1pc USB HUB (with Cable) 1pc USB Adapter Board Package B 2pc USB HUB (with Cable) 1pc USB Adapter Board note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.