Create an All Natural spa-like sanctuary using high frequency vibration to convert Essential Oils and water into a fine, cool mist. The Moonstone Ultrasonic Diffuser can run on one fill of water for about 10 hours. The unit offers 3 cycles: continuous, diffusion for 60 minutes--then off, intermittent diffusion (30 sec on/ 30 sec off) for 120 minutes and then off. You can choose to run it with or without the white LED glow light. When the water runs out, the unit turns off automatically...a safety feature. Stone finish and texture. Fits stylishly into any area. 120ml capacity. Easy to fill, easy to clean and its motor is silent.