To change between the voltage bands with the ghd flight travel hair dryer, adjust the switch located on the handle of the dryer.
To do this, simply insert a ‘tool’ (e.g. coin, screwdriver) that fits in the slot of the voltage switch inside the handle and turn it to either “120V” or “240V” based on the mains voltage of the visiting country.
If you are in doubt please refer to the instructions manual for the product.