6L Large Water Tank: The humidifiers for bedroom can run for up to 50 hours at a time in the lowest output mode. A red light indicator will let you know when it is time to refill the water and will automatically stop misting when the water level drops too low. Note: If there is water leakage during the first use, please pour out the water in the water tank and base. Try taking down the water tank separately to fill it with water, then putting it back on the base and restarting it 2-IN-1 Cool Mist Humidifier and Diffuser: Ultra fine cold mist up to 300ml/h can quickly add moisture to the air in large rooms, helping to alleviate cough, dry skin, sinus problems, and other issues caused by air dryness. The humidifiers for home is recommended to use distilled water and purified water for better health benefits. Put cotton pads with added essential oil in a dedicated oil tank.