This versatile ultrasonic humidifier has three different speed levels, a night-light, and works quietly and efficiently. The humidifier produces less than 38 dB of noise, with a 4-liter tank that lasts for 12-30 hours. It’s ideal for a 107-322-square-foot room, and comes with a built-in humidistat that lets you choose your desired humidity level. With both a nightlight and sleep mode, it’s especially great for bedrooms. Cartridge filters ensure that you’re getting fresh, filtered air.