Hi my straightness are 240v do I need a step up or step down converter to be able to use them in the hotel please ?
If your hair straightener is designed for 240V and you're traveling to the United States, where the standard voltage is 120V, you will need a step-down converter to use your device safely in the hotel. A step-down converter will reduce the voltage from 240V to 120V, allowing you to use your straightener without damaging it.
Ensure that the step-down converter you choose can handle the wattage of your hair straightener. Hair straighteners often consume a fair amount of power, so check the wattage of your device and ensure that the converter is rated for that amount. If the wattage exceeds the capacity of the converter, it could overheat or damage your straightener.
If you don't want to deal with a converter, you may also consider purchasing a 120V version of a straightener during your trip or borrowing one from your hotel if available.