Aromatherapy diffusers use natural oils extracted from flowers, bark, stems, leaves, roots or other parts of a plant to enhance psychological and physical well-being. The inhaled aroma from these essential oils is widely believed to stimulate brain function and promote relaxation. The GreeanAir Serenity Ultrasonic Diffuser uses ultrasonic technology that does not heat or damage crucial oil properties. This device is affordable, reliable, and designed to work for years on end, and its elegant black design brings style to any room. To operate, simply remove top, combine 5 to 6 drops of essential oils in the reservoir with warm tap water, replace dome, and turn on. The GreeanAir Serenity Ultrasonic Diffuser can be used for pain relief, mood enhancement, increased cognition, common colds, or to deodorize air from strong tobacco, food and pet odors. Perfect for spas, studios, bedrooms or office. Product measures 8 x 4 x 8 inches, 1.5 pounds. Run Time: Up to 8 hours.