Vitruvi Stone Essential Oil Diffuser. Fill your home with the subtle scent of essential oils using this beautifully crafted diffuser. Its understated design adds a minimalist touch to any room. Made of a porcelain cover and BPA-free plastic water reservoir. Operates using ultrasonic technology. A button on the diffuser allows you to choose between a continuous 3-hour runtime or an intermittent 7.5-hour runtime, after which it will automatically turn off. Includes a 6-foot-long power cord. Measures 7" x 3.5". Color: Eucalyptus. New, with box. To use, fill up the water reservoir, add 15-20 drops of essential oils, replace the cover and select your time setting. It will automatically turn off when time is up or water runs out. To clean, remove the cover and run it under warm water, using your fingers and a pea-sized amount of soap to buff away marks or dirt. Then rinse again and set aside to dry.