Mini Filter Free Cool Mist Humidifier,Integrated Scent Pad Heater allows you to utilize the soothing scent from Vicks VapoPads,No filters required to operate,Large tank opening for easy access for cleaning,Translucent .5 gallon tank allows for quick and easy monitoring of water level,Quiet operation,Variable humidity control for customized output,Auto shut off when empty,Runs up to 20 hrs per filling on low,Perfect for small size rooms.