Ultimate ultrasonic humidifying technology- creation of micro-fine cool water droplets thanks to ceramic disc vibrations3 modes: auto /unique baby mode/ night to suit to your daily needsWarm mist function: speeds up the humidity output by 20% and guarantees a bacteria-free steamElectronic hygrometer- adjusts humidity rate between 40% and 75% RHOnly 40 dB whisper quiet operation, 360 steam diffusion and easy maintenance