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SparkFun Qwiic / STEMMA QT HAT for Raspberry Pi : ID 4688 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Raspberry Pi 4 PoE HAT 802.3af Power Over Ethernet Expansion Board with Cooling Fan Temperature OLED for Raspberry Pi 3B+ 4B|Demo Board Accessories| - AliExpress
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Amazon.com: Power Management HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+Zero/Zero W,with ATmega328P MCU for Ard Programming PCF8523 RTC Chip,UART + GPIO Communication Interface and User-Defined Button : Electronics
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