Great humidifier! Very simple to set up and operate. We noticed the difference in our bedroom the first night. My wife's breathing wasn't labored and we both had a good nights sleep. Also, we slept peacefully through the night. It has three speeds. The lowest is very quite and actually the sound helps you go to sleep. We set the speed on high a few hours before bedtime and lower it at bedtime. The two tank system works really well. With no pump, the noise level is minimal. Easier to clean and fill water containers.