What kind of plug does this have? can i ise in in the usa? or do i have to take it to a store to convert it?

It's a regular oulet.. and yes you can use it in the USA. I really like it compared to other ones that I've tried.

Has anyone used this in Europe -- especially Italy? How does it work there?

Yes, you can as this is world auto voltage so they will automatically work just make sure to “press and hold”the power button for 2 second and it will turn on” automatically. (Due to child safety issues)

Double negative ionic Automatic World Voltage hair styler with 2 brush - Made in Japan (2020 Model)

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