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If it uses a standard USB jack (the flat one) like on your computer, it is 5 Volts +/- 5%
WHICH BRINGS UP
A Real USB port has a limit of 500ma (0.5A) built into the drive chip, which is why you need a external 'charger' for those power hungry Tablets and phones
The port will trip the over current circuit and will need to be reset if the device does not shift to SLOW/no charge mode
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