Features:-The 4L water tank provides up to 40 hours of humidification, and the built-in humidity sensor adjusts the humidity to maintain consistent humidity for a healthy environment.-The top-fill design allows you to easily fill the water without having to flip the tank over and spill the water. The large opening allows you to easily clean the inside of the tank.-Built-in mute setting keeps quiet for long periods of time with a noise level of only 23dB.-There are three spray modes, continuous spray, double-hole alternating spray and intermittent spray. The continuous spray can be used for 10 hours, the intermittent spray can be used for 20 hours.-With night light, long press the button to turn on the night light to accompany you in that dark night.-It has a.