High RPM of 18,500 brush motor and dual wave shape blades results in faster drying of hands and low noise 70dB. Intelligent LED display - One of the best in its category. Sturdy construction of ABS body keeps the dryer stable and maintenance free. HEPA filter 99.9% of the bacteria, provides pure air. Hidden switch: High and low speed air speed; heat system on/off. Intelligent automatic hot and cold air control saves electricity. Drain Tank with level window, keeps the ground clean.