This is an industrial USB to RS485 converter with original FT232RL and SP485EEN inside. It features embedded protection circuits such as lightning-proof, resettable fuse, ESD protection, and TVS diode, etc. It's pretty small in size.
The PoE/ETH/USB HUB HAT is a PoE (Power over Ethernet) USB HUB HAT designed for Raspberry Pi Zero. By using this small HAT and some proper 802.3af-compliant power sourcing equipments, it is possible to provide both network connection and power supply for your Raspberry Pi in only one Ethernet cable, along with 3x extended USB ports.