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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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Amazon.com: DSLRKIT Power Over Ethernet PoE HAT IEEE802.3af DC 5V 2.5A with 1.5KV Isolation for Raspberry Pi 4B 3B+ 3B Plus : Electronics
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Raspberry Pi PoE Hat : ID 3953 : $20.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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