The BaByliss Digital ST500E has a digital sensor. This sensor measures the thickness of the lock of hair that you first pass through the plates. The hair straightener then sets the most suitable temperature itself. Great, because that way you know for sure that the plates don't get too hot. Another advantage of the sensor is that the temperature remains constant. You only have to go through your hair once in a while to make it straight. And the less often you have to style your hair, the safer for your hair. Furthermore, the straightener is particularly user-friendly. The plates are ready for use in 15 seconds and you can see the exact temperature on the LCD display.