This is a 4-port USB hub to provide more USB capacity to your what more, features USB to UART converter for easy serial communication.
4 USB ports, for USB2.0/1.1.
Built-in USB to UART, with on/off switch, convenient for serial debugging and avoiding conflict.
Multiple built-in indicators, for power, USB to UART and each USB port.
It can work with various versions and the size of the plate is designed to perfectly fit the / ZeroW / ZeroWH. It can also fit in 2B/3B/3B+/4B.