Ultra-quiet Automatic Power-off Protection220ml capacity, can work for 2-6 hours, automatic power-off when water is short. 20dB ultra-quiet work, helps to soothe the mood, relieve stress, and improve sleep quality. And, with the help of the built-in smart chip, it will automatically stop working when there is water shortage, which is very safe and reliable.Fully Adjustable andamp Timer2 Brightness levels of night light as "violent flame" and "soft flame". 3 Timer settings: 1h or 3h or 6h. Quiet operation, wont make noise when youre working or sleeping, ideal for your bedroom, office, gym, spa or yoga.Auto Off andamp Save Energy8Oz or 220ml water tank, 30-40ml or h large mist output. Auto shut off when there is no water in the water tank, safe to use. 5V USB powered, low energy consumption even for long time use.Aromatherapy Essential Oil can be Addedspecially designed ultrasonic aromatherapy, after adding water, only one or two drops of aromatherapy essential oil can be added to make the house full of aroma. Relax, soothe and enjoy your life better with our fragrance diffusers.