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30W Universal Power Adapter, USB Multi-Voltage Output Multi-Function Power Adapter 3-12V US Regulatory General with 6 Adapter Converted Head and USB Port - Walmart.com
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voltage - Why does USB have Vcc=5V and high=3.3V? - Electrical Engineering Stack Exchange
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USB QC2.0 3.0 Current and Voltage Charger Capacity Tester USB 3-20V Charger Powers Meter Voltmeter
