While many products purchased in countries outside of the USA will have auto-ranging power supplies, it is much less common to find them in the USA. The reason is that companies are cutting costs every chance they get in order to stay competitive on the US market, so they go for the cheapest power supply they can get.
As a result, it is very likely that the power supply will need to be replaced when you come back here, but that usually isn't such a big deal anyway, as power supplies are fairly easily replaced these days. You may get lucky, but I think the chances are low. Ask the vendor in advance if in doubt.
Eric
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