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. Built-in 2000mAh battery, portable humidifier, moisturizing the skin anytime and anywhere;Size: 9.5*9.5*19.6cm (3.74*3.74*7.71inch) The base rotation mode automatically sprays in different directions, which is more uniform. Night light mode, built-in projection night light, create an atmosphere in the room at night. Use time: about 1.5 hours when all functions are turned on / about 4 hours when only using spray mode.