Raspberry Pi 3B+ 3B Plus Power Over Ethernet PoE HAT IEEE802.3af DC 5V 2.5A

Compliant IEEE802.3af PoE standard. Support the IEEE 802.3af/802.3at the Power over Ethernet PoE Switch. DSLRKIT Power over Ethernet (PoE) HAT for Raspberry Pi 3B+ 3B Plus. The product must be used in conjunction with a Raspberry Pi 3B+ and a PoE switch (or PoE injector).

eBay