Rowenta HU5120 Intense Aqua Control Whole Room Mist Humidifier Ultrasonic Technology with Unique Baby Mode, 1.5-Gal, Bronze Ultimate ultrasonic humidifying technology- creation of micro-fine cool water droplets thanks to ceramic disc vibrations 3 modes: auto /unique baby mode/ night to suit to your daily needs Warm mist function: speeds up the humidity output by 20% and guarantees a bacteria-free steam Electronic hygrometer- adjusts humidity rate between 40% and 75% RH Only 40 dB whisper quiet operation, 360 steam diffusion and easy maintenance