Young Living Ember Diffuser Black Terra Cotta Rubberwood. It features a terracotta cover and a sustainable rubberwood base. The diffuser uses ultrasonic vibrations to atomize water and essential oils into a fine mist. High diffusion mode runs up to 3.5 hours, and intermittent mode runs up to 7 hours. It includes a subtle light feature with eight color options that can run independently of the diffusion function. It covers an area of approximately 35 square meters (375 square feet).