This straight hairbrush uses a 3D tooth shape design to help smooth the hairline and make the hair completely smooth. The denser steps increase the contact area between the teeth and the hair, ensuring that all the hair can be heated and close to the surface of the teeth, and that the hair is completely smoothed out.The ceramic coating can reduce the damage to the hair, it can produce a powerful quality of negative ions to seal the moisture in the hair and protect each cuticle to eliminate frizz and static electricity, making the hair smoother and shiny.PTC ceramic heating element, thermostatically controlled at 200 C, kept for almost 36h, 30s rapid heating provides rapid heat, the most important is the even heat distribution, it can easily turn curly hair into straight hair in a few minutes, while maintaining a constant and uniform heat.Avoid damage to the hair.7 heating temperature levels 100-200 C (212 F-392 F) can be selected to suit various hair conditions. This hairbrush straightener can adjust different hair qualities, such as soft, rough and thick hair, so that you can look beautiful in the shortest time.The LED indicator provides you with a visible indicator of the comb temperature. The 360 degree rotating cord means you can hold the device at any angle for the best straightening effect without having to bend the cord.