The Raven Ultrasonic Essential Oil Diffuser adds a sleek and modern look to any space. With up to 6-hours of continuous run time this diffuser transforms your water and essential oil into a fragrant mist Up to 6 hours continuous mist, Up to 12 hours intermittent mist Medium Room Size 200mL / 6.76 fl oz Water Capacity Includes cETLus certified AC adapter Automatic Safety shut off