The Ember diffuser cover is carefully crafted from natural terra-cotta clay, molded, hand-refined and baked in a kiln for 10 hours. The base is constructed from sustainable rubber-wood cultivated in Thailand from mature trees previously tapped for rubber production. Between these two natural materials is a luminous ring of light reminiscent of a glowing ember. With eight light options and two operating modes, Ember brings designforward elegance and pure aromatherapy to your space. Directions: Fill the reservoir with water and add 8-20 drops of essential oil. Select diffusion and light modes and enjoy. Features & Benefits: Coverage area of a medium-sized room, approximately 375 square feet (35 square meters) High diffusion mode can diffuse up to 3.5 hours Intermittent mode can diffuse up to 7 hours Has eight color options that can run independent of diffuser function Features a terra-cotta cover and rubber-wood base made of natural materials Compact, space-saving size is ideal for tabletops and offices Subtle lighting feature makes it a perfect addition for your bedroom at night Listing is for diffuser only. No oils are included.