The Steamfast™ SF-920 Steam Humidifier is a great choice for creating a well-humidified, comfortable living environment in your home. It features a removable 1-gallon water tank with an integrated handle, plus it has a top-fill design that makes it quick and easy to fill the water tank. If the water runs out, the SF-920 will automatically shut off on its own. The SF-920 provides efficient steam power and has a fast, 3-minute heat-up time, so you don't have to wait long for warm moisture. If you like to use essential oils in your home, the SF-920 has an aromatherapy oil ring for you to insert your oils (oils not included). The Steamfast™ SF-920 Steam Humidifier will provide warm mist humidification in small- or medium-sized rooms in your home.