4 Port USB HUB HAT for Raspberry Pi, USB to UART Onboard
Overview
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 / Zero WH.It can also fit in Raspberry Pi 2B/3B/3B+/4B.
USB HUB HAT Features

4 USB Ports, compatible with USB2.0/1.1
Onboard USB to UART, with enable / disable switch, convenient for Raspberry Pi serial debugging and avoiding conflict
Onboard multi indicators, for monitoring the status of power, USB to UART, and each USB port

Specifications
Operating voltage: 5V
Dimension: 65mm × 30mm
Mounting hole size: 3.0mm
Package Content
1.USB HUB HAT x1
2.Micro USB connector x1
3.Micro USB cable x1
4.RPi screws pack (2pcs) x1

Development Resources
https://www.waveshare.com/wiki/USB_HUB_HAT