HoMedics TotalComfort Deluxe Humidifier 3,8 L - EachAbout HoMedics TotalComfort Deluxe Humidifier, 1 gallon (1 Unit) The TotalComfort Deluxe Ultrasonic Humidifier uses ultrasonic technology with warm or cool mist options and kills up to 99. 9% of bacteria with warm mist The 1. 0 gallon tank is easy to remove and fill and runs up to 120 hours per filling Auto shutoff protection when tank is empty and a built in timer for up to 12 hours Includes an essential oil tray with 3 pads and 2 demineralization