This beautifully designed, travel-size aromatherapy diffuser offers a new and sophisticated way to fill any space with the scents you love. Simply add water and the essential oil of your choice, then turn it on. Through a ceramic resonator, the product uses ultrasonic vibrations to turn the fragrant water into mist, dispersing it unobtrusively into the air. 2 3/4" x 2 3/4" x 4 3/4" Three-hour continuous operation; six-hour intermittent operation