Aliza Professional Hair Dryer 4000 IonicAliza Professional Hair Dryer 4000 Ionic The Aliza 4000 ionic professional hair dryer is more resistant and for professional use in salons and barbers. Like the Aliza 2000 Ionic professional hairdryer, it has dual speed control and three temperature settings. Heated up to 250 degrees, the 2000 and 4000 models allow for effortless styling, while the cool shot setting provides long lasting hold and shine alongside ion technology that seals hair cuticles