The Air Innovations model 505 ultrasonic, cool mist, smart humidifier is one of the top rated, longest running, and most versatile humidifiers available for its size. Key Features: 1.37-gallon tank that runs for a full 70 hrs. on low (almost 9 nights of sleep) and is completely silent when running. Powerful enough to add humidity to large rooms up to 400 SQ ft., with a programmable built in humidistat that monitors and maintains the humidity level you set. The entire unit and base are made of antimicrobial plastic to prevent bacteria, mold, and mildew growth and it comes with a permanent ceramic filter to help trap impurities in your water. It also has a 360 degree rotating mist nozzle helps direct the moisture where you want it. Unlike Vicks, Crane and Essic humidifiers, it also has a built in handle on the top and bottom of the tank with extra wide opening for easy filling and carrying as well as a fully programmable timer to turn it on and off when you want it to. Auto safety shut off and audio beep when it runs out of water. Great for kids and babies, this cool mist humidifier also rehydrates your skin, relieves dry eyes, scratchy throats, post nasal drip and helps reduce snoring so you sleep better. As a bonus, it also rehydrates wood furniture, cabinets, wood floors and wooden guitars.