Honeywell QuietCare™ 4.0 Gallon Cool Moisture Humidifier 2 in 1 Tower uses cool moisture to quietly provide natural relief from dry air. The EasySet™ Electronic Controls are simple to use with individual controls for desired speed and humidity, making it easy to maintain your desired comfort level. Plus, your humidifier stays cleaner, longer with Protec™ Continuous Cleaning which includes a Protec™ Cleaning Cartridge to help provide fresher, cleaner mist. This unit can be separated from the base for desk use. 50% quieter then other tower units and the tray is dishwasher safe. There is an Automatic shut-off, adjustable humidistat, and 3 speed settings. Replacement wick filter: HAC-504AW