The doTERRA Brevi™ Diffuser is a contemporary circle design that offers a sleek, modern look with a beautiful marble white finish. It uses ultrasonic technology with coverage up to 270 square feet. It features automatic shut off when the water level is low, and selectable LED color options: blue, purple, yellow, and warm white - select one or set to cycle through all 4 colors, or no color. The Brevi can run 5 hours continuous or 10 hour intermittent (5 min on/5 min off).