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Amazon.com: Geekworm Raspberry Pi 4B/3B+/3B X735 V3.0 DC 6V-30V Width Voltage Input Power Management with Safe Shutdown & PMW Cooling Fan Expansion Board Compatible with Raspberry Pi 4 Model B : Electronics
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Amazon.com: 4-CH Current/Voltage/Power Monitor HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/W, I2C/SMBus Interface Onboard 0.1Ω 1% Sampling Resistor Measure Bi-Directional Current up to 3.2A Embed 12-bit ADC : Electronics
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