Portable Cordless Hair Straightening BrushThis hair straightener brush adopts 18mm 3D teeth design that helps straighten even the root of the hair to get a completely straight hair look. The denser pitch increases the contact area between the teeth and hair, ensures all hair can be heated and closed to the teeth surface tightly, straightening your hair completely. USB rechargeable, the 4000mAh battery can provide 40 minutes of long use time. Cordless hair curler is without cable restraints,