This is a 4 port USB hub for Raspberry Pi, provides more USB capability to your Pi, what's more, it features USB to UART converter for easy serial communication.
It can work with various versions of the Pi, and the size of the board is designed to perfectly fit the Zero / Zero W.
4 USB Ports, compatible with USB2.0/1.1
Onboard USB to UART, convenient for Raspberry Pi serial debugging
Onboard multi indicators, for monitoring the status of power, USB to UART, and each USB port
Operating voltage: 5V
1x Raspberry Pi 4 Port USB Hub Expansion Board UART Raspberry Zero/Zero W/3B+