Walgreens Cool Mist 0.8 Gallon Humidifier with Filter - 2 Pack Better breathing and a good night's sleep Self-regulating evaporative system.* Max moisture and quiet sleep settings. Up to 12 hours of operation** per filling. (Small - medium size rooms****). Humidity helps offer an effective solution to counteract the effects of dry harsh winter air by adding essential moisture to any room. Temporarily relieve dry air discomforts . Keeps throat and nasal passages hydrated .Helps you breathe better and sleep more comfortably Reduces static electricity by returning moisture to dry air to reduce static shocks