The Teardrop collection from Serene House introduces a new take on classic diffuser shapes while maintaining style and sophistication that sets us apart from the competition. The VaporUltrasonic Aromatherapy Diffuser has a 4hr continuous / 8hr intermittent run time in addition to the 60, 90- and 120-minute timer modes. The 7 rotating or fixed LED lights add ambiance to any room. Simply add water and the essential oil of your choice, then turn it on.