Review on Guardian H4750AR Ultrasonic Humidifier Essential by Michael Welborn

Good humidifier with lots of water. However, the 120 hours of operating time are greatly exaggerated. I had it on the lowest settings and only worked at night. I used 4 nights before I had to fill it up, the 5th night would be 1/2 night empty. I sleep about 6-7 hours a night so I expect at best 36 hours between full lifts on the lowest settings. Can't comment on the ultrasonic part, I filled it out, plugged it in and turned it on and right away you can see the mist coming out the top. If ultrasound means you shouldn't see a fog then it's definitely not ultrasound, but if ultrasound means anything else then I have no idea. I love that it has a split nozzle at the top so you can direct the mist in 2 different directions. It's a humidifier and does just that, but for everything it does and the length of actual run time, it's definitely overpriced. You can buy anything at Revain for half the price and get the same performance and quality.