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Raspberry Pi HAT "Hardware Attached on Top" Accessory Power Over Ethernet in a smaller, more efficient Pi-HAT than the official one from Raspberry Pi. This design fits in the official Pi enclosure and takes up less of the board. This Pi HAT fits Raspberry PI 3 B+ and Raspberry Pi4. Key Features Fits Raspberry Pi 3 B+ and Raspberry Pi 4 (Not Included) Works with an IEEE 802.3af switch or 48v injector (Active PoE Only) Smaller, more space efficient than Official Pi-HAT Optocoupled with flyback topology to prevent shorting the board Fanless Increases efficiency above 90% for DC to DC conversion