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. 1-12 hours timing function, automatically stop fogging at the point 4L large capacity, humidification for up to 16 hours, humidification overnight, no need to add water repeatedly, saving worry and effort The design of adding water on the top makes adding water fast, without bending over, easy and convenient. Large-caliber water tank, easy to clean; automatic shutdown without water to prevent dry burning, safe and secure