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MakerHawk USB 3.0 Tester, USB Power Meter, 3.7-30V 0-4A Voltage Tester Multimeter, USB Current Meter Tester, IPS Color Display Voltmeter Ammeter, USB Charger Tester AT34 - - Amazon.com
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What voltage is in a phone micro USB? Is it more than 3.7V so it can power a little amplifier? - Quora
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