The Air Innovations model 602 ultrasonic, cool mist, smart humidifier is one of the top rated, longest running, and most versatile humidifiers available for its size. Key features: 1.6-gallon tank that runs for a full 80 hrs. on low (8 nights of sleep) and is completely silent when running. Powerful enough to add humidity to large rooms up to 500 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.