?Safe and Easy to Use? Temperature auto lock to avoid wrong operation during styling. (Quickly double press the power button to unlock). It automatically shut off after 40 minutes for greater safety in case you forget to turn it off. Dual voltage 100-240V~ for worldwide use. ?3 Heats for All Hair Types? In only 30 seconds, this curling brush is ready for you to start styling. Press the power button to choose the different heat according to your hair type. 430? for thick/dense hair, 380? for medium volume hair, 320? for soft/thin hair. The longer time your hair is heated, the tighter the curls will be. We suggest to curl for 10-15 seconds. ?Tourmaline Ceramic Barrel for Healthier Hair? The 3X tourmaline ceramic coating barrel release millions of negative ions while delivering even heat, help to reduce frizz and lock more moisture, make your hair shiny and healthy. ?You’ll Never Get Burned!? Anti-scald nylon bristles and big cool tip effectively prevent you from burning. No tangling issues if you comb through and section your hair before styling. ?3 in 1 Multifunctional? You can use it as a curling iron, straightening brush or normal comb. NOTE: NO HOT AIR BRUSH!!!.