A higher relative humidity helps to avoid dry air, which can lead to irritation and discomfort. Ultrasonic technology: The ultrasonic humidifier generates high-frequency vibrations that transform up to 300 ml of water per hour into a fine mist. Intelligent automatic control: The Cascada ultrasonic humidifier is equipped with built-in sensors that maintain a perfect room climate. The humidity level can be adjusted from RH 30% to RH 90%. Silent operation: The ultrasonic humidification is very quiet, producing less than 36 dB of sound. This product also features a timer, and the LCD screen's lighting can be dimmed.