This quiet humidifier has mood-enhancing LED rotating ambiance lights (7 colors) or you can set it on one color. Each color has two brightness options, so you can choose the perfect light to assist with your mood. Tank capacity is 300 ml. You fill the tank with water and add a few drops of essential oil to the tank. Effectively emits aroma approximately 430 square feet and humidification for 260 square feet. You can set the timer for 1 hour, 3 hours or 6 hours. Effectively emits aroma approximately 430 square feet and humidification for 260 square feet. A/C adapter 100-240V.