Heaven Fresh HF710-B Digital Ultrasonic Cool & Warm Mist Humidifier with Aroma Function, Black Variable spray mist control for use with small, medium or large rooms Large capacity water tank (6L/1.6 gallon) refills with normal tap water High moisture output can quickly humidify a room up to 60 m (650 ft) Auto Hygrostat sensor automatically regulates mist output according to desired humidity level Low energy consumption - can save 85-90% of electricity costs compared to a normal steam humidifier