JolyJoy 4L / 1 Gallon Ultrasonic Cool Mist Humidifier Filter Free 16 Hours Super Quiet Waterless Auto-off Humidifiers for Bedroom Air Purifier (White) Big Capacity, Long Working time: 4L / 1Gallon water tank lets the humidifier run up to 16 hours without needing a refill. We do not recommend adding any essential oil or similar chemical perfume in the water. Whole 360 degree rotatable nozzle silently diffuses cooling moisture into any direction you want. Helps you and your kids, baby, pet to relieve dryness and improve the night sleep. Whisper-Quiet & Adjustable Mist Output: Easy press button allows 3 levels of the mist output up to 350ml/h, ideal for air humidifying in single room or big bedroom. And the negative ion produced by ultrasonic vibration will help to purify the air and restrain bacteria. More Advantages: Pure white color easily fits for morden home office style. Slim and compact, space saving. Water-less Automatic Shut-off for electric safety. Filter Free, No fitting needed. Easy to clean. What you will get: 1 gallon ultrasonic cool mist humidifier, using manual, and Worry-free after service. 30-Day money back within 12-Month product guarantee. If not satisfied, you can contact us for refund or replacement.