2 easy ways to fill via humidifier or sink. Adjustable humidity control & 3 output settings. Translucent tank sits flat in sink or tub for filling. Refill light and humidity reached indicator. Runs up to 24 hours. Auto shut off when empty. Multi Room Use. Two water tanks: 1.5 gallon each. Easy to clean, carry and fill. Room size: extra large or multi-room. Moisture Type: invisible cool moisture. Replacement Filter E: Model HC14V1. 3 Year Limited Warranty.