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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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GPS Charger Cable,Mini USB 6.6ft Universal GPS Charging Cord with Voltage Regulator Module 90 Degree Angle Mini USB Power Wire for Garmin GPS Navigator Drive 51 65 Nuvi 50lm 2555lmt 2595lmt - Walmart.com
Are some USB to mini USB cables designed only for power and can not work with data or should any cable work for all devices? - Quora
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