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Amazon.com: 4B/3B+ Cooling Fan Temperature Control Expansion Board RGB for Raspberry Pi 4B/3B+/3B : Electronics
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Fan Controller for Raspberry Pi | The Pi Hut
Amazon.com: Temperature Control Module for Raspberry Pi, Power Expansion Board with Cooling Fan, LED Display Cooling Hat Board for Single Board Computers : Electronics
EZ Fan2 Tiny Raspberry Pi Fan Controller from JC Devices on Tindie