Votiv 4 delivers the hydrating and soothing effects of ultrasonic humidification along with a flameless flicker that creates the calming, elemental atmosphere of a real candle. The light travels through the natural flow of the mist, delivering a more natural effect than the looping flicker pattern of most traditional flameless candles. 2 humidification settings produce 1 gallon of humidity per day on high, and.5 gallon on low. Votiv 4 features a 40oz. tank to limit refills to 7.5 hours on high and 15 hours on low. When you combine powerful humidification with Candle-like illumination - Votiv 4 is the perfect way to humidify your physical space and calm your mental space for a multi-dimensional feeling of well-being.