Charging iPhone 4s in Italy via USB

We are travelling to Italy next month. I have an adapter with a dual USB charger. Can we charge an iPhone 4s using the USB ports on the adapter? I am concerned about the voltage. I understand that the Apple A/C charger with an adapter for Italy is fine but what about charging via USB?

No. You need to use the adaptor that came with your phone. Most third-party chargers don't supply sufficient power to charge the phone's battery. That is why a separate charger is provided with the phone. You will need a wall outlet plug adaptor, however.

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