This PoE HAT is an 802.3 af/at-compliant Power Over Ethernet accessory for Raspberry Pi 5. (Not fits PI4B and PI3B). ^^ Onboard standard Pi 40PIN GPIO stackable header, easy connecting with other HATs. ^^ With using this small Pi 5 HAT and some proper 802.3 af/at-compliant power sourcing equipment, it is very easy to provide both network connection and power supply for your Raspberry Pi by one Ethernet cable. ^^ Onboard cooling fan with meatal heat sink: Provides better heat dissipation ^^ Onboard 0.87 inch OLED display, used to display information such as the Pi 5 mainboard CPU temperature and IP address.