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USB chargers should be 5V (with a 5% accepted differential). Amperages may vary, but the voltage shouldn't go over the 5% leeway. If it does, then it's not a USB charger (at least not for USB 2.0/1.1 devices).
As for amperage, just check the label (provided it's correct) and make sure that the charger doesn't put out more than 500 mA (or 0.5 A). Seeing how the output of the included charger is a possible 1 A, I would assume any other USB charger @ 5V with 0.5 A to 1 A of output should suffice.
With that said, I do have a very similar USB wall charger that I use with my PP instead of plugging in the included one. It works to charge my other USB devices and also is rated at 0.5 A to 1 A. No problems with it.
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