Cool Misting Ultrasonic Humidifier | 1 Gallon Tank, 36 Hour Runtime, Nightlight, Auto Shut-Off, Refill Indicator Light | Clean Tank Technology, BONUS DEMINERALIZATION CARTRIDGE | HoMedics HUMIDIFY YOUR SPACE ALL DAY LONG: The Ultrasonic Humidifier by HoMedics features a large easy-to-remove 1-gallon tank. This large tank can humidify your home for up to 36 hours. The cooler temperature of the mist gives the air a refreshing smell and feel. In cold winter months, the heat is turned up making the air drier. The dry air can result in sore throats, coughing, trouble breathing and nosebleeds. Raise the humidity level in your home with HoMedics Cool Mister to breathe easy REDUCES ALLERGIES CAUSED BY WHITE DUST: This misting device features a clean mist anti-microbial technology that helps prevent the growth of mold and mildew on the surface of the tank. It also prevents the buildup of white dust caused by hard water that can settle on your floor, appliances, and furniture. HoMedics includes a free demineralization cartridge that is designed to reduce the white dust buildup. The dust can create additional allergens in your home SAVE MONEY WITH THIS HUMIDIFIER: This cool-misting humidifier has the functionality of 5 different machines. It was designed with ultrasonic technology, a built-in on/off nightlight, auto shut-off protection, LED refill indicator, and a long runtime. When the nightlight is on it creates a soft glow. Its automatic shut-off protection ensures your humidifier wont continue running when its water level gets low. The LED refill indicator light turns on when its time to refill the tank EASY TO USE AND CLEAN: Turn the power off and unplug the unit from the outlet. Take the tank out of the humidifier base. Turn the tank upside down and remove the cap. Fill the tank with clean, cool tap water. Turn on your humidifier. TO CLEAN: To remove any scale or build-up, use a 50/50 mixture of vinegar and lukewarm water to clean the inside of the tank. We recommend cleaning the tank every 2-3 weeks, depending on usage and water conditions WHATS INCLUDED WITH YOUR PURCHASE: One HoMedics Cool Mist Ultrasonic Humidifier. One BONUS demineralization cartridge. One users manual. One Year Limited Warranty