Quiet Operation for Large Room Use: Ultrasonic humidifiers are incredibly silent, reduces noise to 26dB; perfect gift for Mother's Day, and for your baby, a disturbance-free sleep at night4L Tank Capacity & Mist Adjustable: Over 1.06 gallon of water lasts for 12-50 hour working time on a full tank; designed to humidify the air in rooms up to 20-40 m² / 215-430 ft²95mm Water Inlet: Allows you to refill and clean the machine with ease and convenience. There won’t be any spill when filling, and you can fit your hand into the tank to clean it thoroughly2ft Mist Height: This black cool mist humidifier designed with 360°degree rotating nozzle at a height of up to 24 inches ensures an even level of humidity distributed in your home and not easy to wet the desktopSmart Personal Humidifier with Low Water Warning: The ultrasonic air humidifier will stop misting to prevent the device from overheating when the water's drained