To check whether your curling iron is dual voltage you can follow these steps:
Normally, curling traverse devices have a tag on their handle, plug or wire that has information on the voltage, search for words such as:
If there is a list that contains a range for example it mentions 110-240v then it is dual voltage, however if there is only one voltage listed then you do not have a dual voltage.
In the user manual, there is a detailed elaboration on almost everything and that also includes if the curling iron is capable of handling dual voltage or not, mostly focus on the power and voltage section.
Usually, dual voltage curling irons tend to have a switch present on the device or on the plug that allows the user to switch between 110V and 220V, if your curling iron is capable of doing that consider it dual voltage but make sure to change the switch accordingly before usage.
When the product’s manual is not informative, check the brand and the model number of the curlers online. Most of the time the manufacturers or the sellers include the voltage in the description of the product sold.
In likelihood you may be confused, do call the manufacturer themselves. They will be able and are knowledgeable enough to confirm this by having the model number of the product at hand.
Since now these details are clear, there is no doubt that with the use of devices such as a curling iron, international travel is possible because the devices are wide-voltage.