Features & details Double Negative Ions: The GLAMFIELDS hair straightening brush seal the hair cuticles and lock in your hairs natural moisture, to eliminate frizz, split ends, knotting and adds shine, repairing the hair quality of harm, make a smooth, silky, natural lustrous look. Advanced MCH technology: Characterized by Heat Quickly, Save Energy, More Durable, Lasts Longer,it heats up within 30 seconds after boot, wider and denser comb tooth also decrease the time of straightening. 4 Heating Setting: There be four different temperature levels from 330˚F to 450˚F (170°C -230°C), to provide you with total control for all your hair condition and hair styling needs. Easy To Use & Travel Friendly: Small Size with 360 rotating handle, which is easy to operate with one hand to reduce the pressure of the wrist, the international dual voltage 110-240V with extra compatible adapter perfect for travel and vacation. Safety Controls: Made of High-quality flame-retardant plastic, the automatic shut-off after 30mins no action for security, temperature lock function can avoid accidentally changing the temperature.