Sleep in total silence. No need to tolerate hums and whistles. The peaceful sleeping atmosphere for you.and safely every night thanks to the auto-shut off feature and nearly silent operation. High-frequency atomized humidification, power button press once, continuous spray. Press twice, intermittent spray (spray 15 seconds stop 15 seconds). Built-in night light, 3000k color temperature, comfortable with sleep without blinding. Working softly, no more than 30dB, quiet and do not disturb sleep. Timing function: press the timer button once for one hour, press it twice for two hours.