Yes, the PRCD plug can be carried in hand luggage. The plug is H71mm x L150mm x W41mm in size. It's an additional safety element, engineered with key electronics, to help reduce the size and weight of the straightener itself. If you intend to travel with your Dyson Airstrait™ straightener please check the voltage of your destination country matches your straightener. You can find the voltage in your user guide.