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Argon Fan HAT for Raspberry Pi 4 Model B and Raspberry Pi 3 Model B | 40mm Raspberry Pi Fan with Power Button | PWM and Software Controllable | Easy Setup - Walmart.com
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Amazon.com: MakerFocus Raspberry Pi 2B/3B/3B+ Armor Case, Raspberry Pi Metal Case with Dual Cooling Fan Aluminium Alloy, Built-in Heatsink, Radiation and Rust Protection for RPI 2B/3B/3B+ : Electronics
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Amazon.com: Armor Case for Raspberry Pi 3B+/3B, Aluminum Alloy Metal Case with Passive Cooling/Shell Heat Dissipation Compatible with Raspberry Pi 3 Model B+/3B : Electronics
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