Color: White : Still be bothered by congestion, coughing, or dry mouth when sleeping? With a 25W power rating, the impressive 3-liter tank provides 25 hours of moisture, helping you sleep comfortably for 3 nights with one single refill. - : With Levoit's upgraded Top-Fill design, there's no need to turn over the water tank no spilling water all over the floor. Just remove the cover and fill the tank with ease. - - & : Add 10 15 drops of your favorite essential oils to the base chamber to create a fragrant at-home spa. - : Sleep in near silence no need to tolerate hums and whistles. The Dual 150 operates quietly, creating a soothing and peaceful sleeping atmosphere for you every night. And when the water runs out, the humidifier automatically shuts off. & : Use the knob to control the mist output and the 360 nozzle to direct the mist anywhere you like.