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Amazon.com: Power Over Ethernet HAT (B) for Raspberry Pi 3 Model B+ / Raspberry Pi 4 Model B, PoE HAT Board with 0.91" OLED and Cooling Fan, Support 802.3af PoE Network Power-Sourcing
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5V 1.5A Output PoE Module - Works with Raspberry Pi 3 B+ or Pi 4 : ID 3847 : $8.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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5V 1.8A Isolated Output PoE Module - For Raspberry Pi 3 B+ or 4 : ID 3848 : $15.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: PoE Texas Raspberry Pi PoE Hat - Power Over Ethernet PiHat Fits Raspberry Pi 3 B+ and Pi 4 - Slim, Sleek, Compact, Heat Sink, Fanless - Works with Active 802.3af
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Amazon.com: UCTRONICS PoE HAT for Raspberry Pi 4B/3B+, Power Over Ethernet ( PoE) Support 802.3af PoE Network Standard, Compatible with Pi 4B / 3B+ : Electronics
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