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rpi 4 poe hat, Raspberry Pi 4 Power Ethernet Hat (b) 802.3af Poe Network With Cooling Fan Temperature Oled For Raspberry Pi 3b+/4b - Demo Board Accessories - AliExpress, GeeekPi Raspberry Pi 4 Isolated PoE HAT Support IEEE 802.3af or PoE Standard,with Raspberry Pi Cooling 30x30x7mm for Pi 4 Model B / 3B+ 3B Plus : Electronics