CMC TECH 5.2V@3.5A 17.5Watt Power Over Ethernet (POE) HAT for Raspberry Pi 4 Model B and Pi 3 Model B+ IEEE 802.3af or 802.3at PoE Network Standard Compliant (USA Version)
Active 12V PoE power over ethernet Splitter Adapter, IEEE 802.3af Compliant 10/100Mbps, 12V output
PoE IEEE 802.3af versus IEEE 802.3at - enetelecom.com